# 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(60777)   (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) -------- slope = (2--1)/(7-8) = -3 ---- Form: y = mx + b You have m = -3 and y = -1 when x = 8 ; solve for "b": -1 = -3*8 + b b = 22 -------- Equation: f(x) = -3x + 22 Ans: Solve -3x+22 = 0 -3x = -22 x = 22/3 --------------- Cheers, Stan H. ----------------