Question 833053: The line a(12,x) and b(x,8) has a slope of -3/7 what is the value of x. How do I find it?
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39617)   (Show Source):
You can put this solution on YOUR website! You find it by using the formula for slope.
Given points on a plane, points being (p,r) and (u,v), the slope is vertical change divided by horizontal change: 
Answer by MathTherapy(10552)  (Show Source):
You can put this solution on YOUR website! The line a(12,x) and b(x,8) has a slope of -3/7 what is the value of x. How do I find it?We will change coordinate point a from (12, x) to (12, X), and coordinate point b from (x, 8) to (X, 8)
to avoid confusion
Formula for slope, or  , where:
Therefore, becomes: 
7(X - 8) = - 3(12 - X) ------ Cross-multiplying
7X - 56 = - 36 + 3X
7X - 3X = - 36 + 56
4X = 20
 , or 
You can do the check!!
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