SOLUTION: What is the x coordinate of the point at which the line intersects the x axis on a graph with a line going through pint (7,2) and point (8,-1)
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Question 696845: What is the x coordinate of the point at which the line intersects the x axis on a graph with a line going through pint (7,2) and point (8,-1) Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! What is the x coordinate of the point at which the line intersects the x axis on a graph with a line going through point (7,2) and point (8,-1)
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slope = (2--1)/(7-8) = -3
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Form: y = mx + b
You have m = -3 and y = -1 when x = 8 ; solve for "b":
-1 = -3*8 + b
b = 22
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Equation:
f(x) = -3x + 22
Ans:
Solve -3x+22 = 0
-3x = -22
x = 22/3
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Cheers,
Stan H.
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