Question 13770: The slope-intercept equation of the line through the points (7.1,-8.3) and (-2.5,6.7) is y=mx+b.
Where m= 15/-9.6 and b=?
Answer by Alwayscheerful(414)   (Show Source):
You can put this solution on YOUR website! Well, you already have the slope (which is m) so you can plug it right in the equation.
y=15/-9.6x+b
Then in order to solve for b, you must plug in numbers for b and you have two choices.
(7.1,-8.3) and (-2.5, 6.7)
You can choose which ever one is easier for you and i'll use (-2.5, 6.7)
As you probably know, -2.5 is the X value and 6.7 is your Y value.
Then plug them in their places
6.7=15/-9.6(-2.5)+b
To make it easier, -2.5 can be converted into -5/2
6.7=125/32+b
125/32=3.90625
6.7-3.90625=b
b=2.79375
in fraction form, b=447/160
The final answer in slope-intercept form is
y=15/-9.6x+447/160
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