How to find x or y intercept
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Math › How to find x or y intercept
A straight line passes through the points and
.
What is the -intercept of this line?
Explanation
First calculate the slope:
The standard equation for a line is .
In this equation, is the slope of the line, and
is the
-intercept. All points on the line must fit this equation. Plug in either point (1,3) or (2,2).
Plugging in (1,3) we get .
Therefore, .
Our equation for the line is now:
To find the -intercept, we plug in
:
Thus, the -intercept the point (4,0).
Find the x-intercept of the line .
Explanation
Recall that an x-intercept occurs when the line crosses the x-axis. Thus, the y-coordinate of the x-intercept must be .
Plug in for the y-value.
The x-intercept is located at .
What is the y-intercept of the line with the equation ?
Explanation
You should recognize that the given equation is in the point-slope form.
In order to find the y-intercept, rearrange the equation into slope-intercept form, .
Since, , the y-intercept must be located at
Find the y-intercept of the line .
Explanation
Recall that at the y-intercept, the line crosses the y-axis. This means that at the y-intercept, the value of the x-coordinate is .
Plug in for
into the equation to find the y-intercept.
The y-intercept for this line is .
Find the x-intercept(s) for the circle
The circle never intersects the x-axis
Explanation
The x-intercepts of any curve are the x-values where the curve is intersecting the x-axis. This happens when y = 0. To figure out these x-values, plug in 0 for y in the original equation and solve for x:
adding 0 or 0 square doesn't change the value
take the square root of both sides
this means there are two different potential values for x, and we will have to solve for both. First:
add 4 to both sides
Second: again, add 4 to both sides
Our two answers are and
.
What is the y-intercept of a line with the equation ?
Explanation
You should recognize that the given equation is in the point-slope form.
In order to find the y-intercept, rearrange the equation into slope-intercept form, .
Since, , the y-intercept must be located at
Find the y-intercept of the line .
Explanation
Recall that at the y-intercept, the line crosses the y-axis. This means that at the y-intercept, the value of the x-coordinate is .
Plug in for
into the equation to find the y-intercept.
The y-intercept for this line is .
Find the x-intercept of the line .
Explanation
Recall that an x-intercept occurs when the line crosses the x-axis. Thus, the y-coordinate of the x-intercept must be .
Plug in for the y-value.
The x-intercept is located at .
Find the x-intercept for the line .
Explanation
Start by putting the equation into form, where
is the slope, and
is the y-intercept.
By definition, the x-intercept is where the line crosses the x-axis. As such, the y-coordinate of this point must be .
Plug in for
in the equation for this line.
Now, solve for .
The x-intercept is found at .
Find the x-intercept for the line
.
Explanation
To find the x-intercept, plug in 0 for y, since the x-axis is where y = 0
subtract 5 from both sides
multiply both sides by -3
The x-intercept is