All GED Math Resources
Example Questions
Example Question #41 : Slope Intercept Form
Find the equation of a straight line with a slope of that passes through
.
So our final answer should appear in slope-intercept form, with
representing the slope and
representing the y-intercept. We know that our slope is
, meaning
.
Now we have but we still need to find our y-intercept,
.
To solve for the y-intercept, we'll need to use the coordinates given to us in the question to replace the and
. Remember that in a coordinate the
is our first number and our
is the second number, like so:
.
Since we are working with fractions here i'll show how to solve this without a calculator, but using one will make it quicker.
Replace the and y with
and
respectively and then solve as if you solving for
, but with
.
Since we are multiplying with a fraction, our can be changed to look like
, which is
's fraction form. Multiply across both the top and bottom.
So now we have this:
Subtract the on both sides, and since we're subtracting by a fraction we'll need our
to become a fraction too. We can't use
because for adding and subtracting our denominators must be the same, so I will multiply
with
in order to get the same denominator.
Now that our has become
(it's still
, despite how big the fraction looks.) we can use it with our subtraction of
. Subtract only the numerator though, not the denominator.
Now that we have our y-intercept, we can take out the and
and replace our
with
.
Example Question #41 : Linear Algebra
Find the equation of a straight line that has a slope of and passes through
.
Our answer should be in slope-intercept form, with
representing our slope and
representing our y-intercept. We know that our slope is
, which means
.
This should give us , but we still need to find our y-intercept;
.
In order to find our y-intercept, we'll need to replace our and
with those of our coordinates in the question. Remember that in a coordinate the first number is our
while our second number is
, as shown here:
.
Replace and
with that of
and
and then solve the problem as if you were solving for
, but with
.
Both negatives when multiplied cancel to create a positive:
Subtract from both sides:
Our y-intercept is , so now we can take out the
and
and replace the
with
.
Example Question #43 : Slope Intercept Form
Find the equation of a straight line that has a slope of and passes through
So we know we need this problem to end as a slope-intercept formula, with
representing our slope and
representing our y-intercept.
From the question we know that our slope is , which means
. So we have
so far, now we need to find our y-intercept;
.
To find , you need to plug in our coordinates
into the equation. Remember that the first number of a coordinate is your
, and the second one is your
, like this
.
Take the and
of the coordinate and substitute them for your
and
, so you should end up with something looking like this:
Solve the problem from there like you would to find , only with
.
Our y-intercept is , so now we can take out the
and
and substitute the
for
.
Example Question #761 : Ged Math
Rewrite the equation
in slope-intercept form.
The slope-intercept form of the equation of a line is
for some constant .
To rewrite
in this form, it is necessary to solve for , isolating it on the left-side. First, add
to both sides:
Multiply both sides by :
Distribute on the right:
This is the correct choice.
Example Question #41 : Linear Algebra
What is the slope-intercept form of the equation ?
The slope-intercept form of this equation cannot be given.
Recall what the slope intercept form is:
You will need to algebraically rearrange the given equation.
is the slope-intercept form of the equation given in standard form.
Example Question #42 : Linear Algebra
Find the equation of the line the passes through (3,4) with a slope of 2
Recall our point-slope form
Here and
and
So, plugging those in gives us
Lets distribute that 2
and add 4 to both sides
And simplify
Example Question #1 : Standard Form
Which of the following is an example of an equation of a line written in standard form?
The standard form of a line is , where all constants are integers, i.e. whole numbers.
Therefore, the equation written in standard form is .
Example Question #2 : Standard Form
Refer to the above red line. What is its equation in standard form?
First, we need to find the slope of the above line.
Given two points, , the slope can be calculated using the following formula:
Set :
Second, we note that the -intercept is the point
.
Therefore, in the slope-intercept form of a line, we can set and
:
Since we are looking for standard form - that is, - we do the following:
or
Example Question #3 : Standard Form
Write the following equation in standard form:
Standard form of an equation is
.
Rearrange the given equation to make it look like the above equation as follows:
Example Question #4 : Standard Form
Rewrite the following equation in standard form.
The standard form of a line is , where
are integers.
We therefore need to rewrite so it looks like
.
The steps to do this are below:
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