SOLUTION: Hi can I have some help finding an equation of the line with x-intercept -1 and y-intercept 8?

Question 124403:
Hi can I have some help finding an equation of the line with x-intercept -1 and y-intercept 8?
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
If the x-intercept is -1 and y-intercept is 8, then we have the point (-1,0) for the x-intercept and the point (0,8) for the y-intercept

So let's find the equation of the line that goes through (-1,0) and (0,8)

First lets find the slope through the points (,) and (,)

Start with the slope formula (note:

is the first point (,) and

is the second point (,))

Plug in ,,, (these are the coordinates of given points)

Subtract the terms in the numerator to get . Subtract the terms in the denominator to get

Reduce

So the slope is

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Now let's use the point-slope formula to find the equation of the line:

------Point-Slope Formula------
where is the slope, and

is one of the given points

So lets use the Point-Slope Formula to find the equation of the line

Plug in , , and (these values are given)

Rewrite as

Distribute

Multiply and to get

Add to both sides to isolate y

Combine like terms and to get

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Answer:

So the equation of the line which goes through the points (,) and (,) is:

The equation is now in form (which is slope-intercept form) where the slope is and the y-intercept is

Notice if we graph the equation and plot the points (,) and (,), we get this: (note: if you need help with graphing, check out this solver )

Graph of through the points (,) and (,)

Notice how the two points lie on the line. This graphically verifies our answer.
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