ACT Math : Algebra

Study concepts, example questions & explanations for ACT Math

varsity tutors app store varsity tutors android store varsity tutors ibooks store

Example Questions

Example Question #1 : How To Graph An Ordered Pair

In the standard xy coordinate plane, what quadrant(s) could point A lie in, if its x-coordinate and y-coordinate have opposite signs?

Possible Answers:

Quadrant II

Quadrants II and IV

Quadrants IV

Quadrant III

Quadrants I and III

Correct answer:

Quadrants II and IV

Explanation:

We know that right of the origin represents the positive x-direction, and above the origin represents the positive y-direction.  For Quadrant I, both the x-coordinate and y-coordinate must be positive, i.e. (+,+).  For quadrant II, the x-coordinate is negative, while the y-coordinate is positive, i.e. (+, -). For Quadrant III, both coordinates must be negative, i.e. (-, -).  For Quadrant IV, the x-coordinate is positive, and the y-coordinate is negative, i.e. (+, -).

Example Question #2 : How To Graph An Ordered Pair

Which pair of coordinates lies within quadrant II?

Possible Answers:

\(\displaystyle (0, 5)\)

\(\displaystyle (5, 2)\)

\(\displaystyle (-5, 2)\)

\(\displaystyle (-5, -2)\)

\(\displaystyle (-5, 0)\)

Correct answer:

\(\displaystyle (-5, 2)\)

Explanation:

By definition, quadrant I has positive coordinates, quadrant II has \(\displaystyle (-x, +y)\) coordinates, quadrant III has negative coordinates, and quadrant IV has \(\displaystyle (+x, -y)\) coordinates, as shown by the diagram below. Only one answer choice falls within quadrant II. All others lie in other coordinates or one of the axes.

Quadrants

\(\displaystyle (-5, 2)\) - Quadrant II

\(\displaystyle (5, 2)\) - Quadrant I

\(\displaystyle (-5, 0)\) - x-axis

\(\displaystyle (0, 5)\) - y-axis

\(\displaystyle (-5, -2)\) - Quadrant III

Example Question #231 : Algebra

In which Quadrant is the point \(\displaystyle (4, 3)\) located?

Possible Answers:

Quadrant I

Quadrant II

Quadrant III

Quadrant IV

Correct answer:

Quadrant I

Explanation:

To find out which quadrant a point lives in, we need to remember the qualities of each quadrant. By qualities, I mean the signs associated with the x and y values which are dependent on the quadrant the point resides in.

All coordinate pairs that are in Quadrant I will have a positive x value and a positive y value.

All coordinate pairs that are in Quadrant II will have a negative x value and a positive y value.

All coordinate pairs that are in Quadrant III will have a negative x value and a negative y value.

All coordinate pairs that are in Quadrant IV will have a positive x value and a negative y value.

 

For the point \(\displaystyle (4, 3)\),  we see that both the x and y coordinates are positive therefore, the point resides in Quadrant I. Another way to check, we can start from the origin and going right 4 units and up 3 units we will be in the upper-right section of the coordinate-plane, which is also known as Quadrant I.

Example Question #11 : Graphing

Which of the following coordinate pairs is farthest from the origin?

Possible Answers:

\(\displaystyle (2, 5)\)

\(\displaystyle (1, 6)\)

\(\displaystyle (-1, 8)\)

\(\displaystyle (3, 4)\)

\(\displaystyle (0, 7)\)

Correct answer:

\(\displaystyle (-1, 8)\)

Explanation:

Using the distance formula, calculate the distance from each of these points to the origin, (0, 0). While each answer choice has coordinates that add up to seven, (-1, 8) is the coordinate pair that produces the largest distance, namely \(\displaystyle \sqrt{65}\), or approximately 8.06.

Example Question #4 : How To Graph An Ordered Pair

Which point best represents the coordinate \(\displaystyle (2, 6)\)?

Picture8

Possible Answers:

B

C

A

D

Correct answer:

D

Explanation:

To get to \(\displaystyle (2, 6)\), move right along the x-axis by \(\displaystyle 2\), then move up on the y-axis by \(\displaystyle 6\).

The sign in front of each number represents which direction to go on the x or y-axis starting at the origin \(\displaystyle (0,0)\). If the number is positive you go right on the x-axis or up on the y-axis. If the sign is negative then you move to the left on the x-axis or down on the y-axis.

 

Example Question #41 : Graphing

Which point best represents the coordinates \(\displaystyle (-2, 4)\)?

Picture1

Possible Answers:

C

D

A

B

Correct answer:

A

Explanation:

The sign in front of each number represents which direction to go on the x or y-axis starting at the origin \(\displaystyle (0,0)\). If the number is positive you go right on the x-axis or up on the y-axis. If the sign is negative then you move to the left on the x-axis or down on the y-axis.

To get to \(\displaystyle (-2, 4)\), move left on the x-axis by \(\displaystyle 2\), then move up on the y-axis by \(\displaystyle 4\).

Example Question #3 : How To Graph An Ordered Pair

Which point best represents the coordinate \(\displaystyle (0,3)\)?

Picture2

Possible Answers:

A

B

D

C

Correct answer:

D

Explanation:

The sign in front of each number represents which direction to go on the x or y-axis starting at the origin \(\displaystyle (0,0)\). If the number is positive you go right on the x-axis or up on the y-axis. If the sign is negative then you move to the left on the x-axis or down on the y-axis.

To get to \(\displaystyle (0,3)\), only move up by \(\displaystyle 3\) on the y-axis. Do not move along the x-axis because the x-coordinate is \(\displaystyle 0\).

Example Question #1 : Graphing

Which point best represents the coordinate \(\displaystyle (2,2)\)?

Picture3

Possible Answers:

C

D

A

B

Correct answer:

C

Explanation:

To get to \(\displaystyle (2,2)\), move right on the x-axis by \(\displaystyle 2\) then move up on the y-axis by \(\displaystyle 2\).

The sign in front of each number represents which direction to go on the x or y-axis starting at the origin \(\displaystyle (0,0)\). If the number is positive you go right on the x-axis or up on the y-axis. If the sign is negative then you move to the left on the x-axis or down on the y-axis.

 

Example Question #4 : How To Graph An Ordered Pair

Which point best represents the coordinate \(\displaystyle (-5, -3)\)?

Picture4

Possible Answers:

A

C

D

B

Correct answer:

A

Explanation:

To get to \(\displaystyle (-5, -3)\), move left on the x-axis by \(\displaystyle 5\) then move down the y-axis by \(\displaystyle 3\).

The sign in front of each number represents which direction to go on the x or y-axis starting at the origin \(\displaystyle (0,0)\). If the number is positive you go right on the x-axis or up on the y-axis. If the sign is negative then you move to the left on the x-axis or down on the y-axis.

 

Example Question #5 : How To Graph An Ordered Pair

Which point best represents the coordinate \(\displaystyle (3, -1)\)?

Picture5

Possible Answers:

B

A

C

D

Correct answer:

B

Explanation:

The sign in front of each number represents which direction to go on the x or y-axis starting at the origin \(\displaystyle (0,0)\). If the number is positive you go right on the x-axis or up on the y-axis. If the sign is negative then you move to the left on the x-axis or down on the y-axis.

To get to \(\displaystyle (3, -1)\), move right on the x-axis by \(\displaystyle 3\), then move down on the y-axis by \(\displaystyle 1\).

Learning Tools by Varsity Tutors