SOLUTION: a real life problem based on y and x intercept and solve it

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Question 275679: a real life problem based on y and x intercept and solve it
Found 2 solutions by richwmiller, JBarnum:
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
just look through the problems solved for linear equations and pick one.

Answer by JBarnum(2146) About Me  (Show Source):
You can put this solution on YOUR website!
the highest point of the roof is 20ft high. the lowest point of the roof is 10 ft high and 10ft from the highest point. write the equation for the slant of the roof.
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according the the above statements the highest point is at (0,20) and the lowest point is at (10,10). use the pointslope formula to find the slope
m=%28%28y-y%29%2F%28x-x%29%29
m=%28%2820-10%29%2F%280-10%29%29
m=%2810%29%2F%28-10%29
m=-1 now use the intercept formula to find the intercept
y=mx%2Bb
20=-1%280%29%2Bb b=20 for y-intercept
so the line looks like
y=-1x%2B20