Find the x intercept for the following equations:

(a) y = 9x – 72 The x intercept is the point where the line crosses the x axis. Since the line crosses the x axis where y = 0, zero is the y coordinate of the x intercept. To find the x coordinate, simply set y = 0 and solve the equation for x:

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(b) y 13x+169 Setting y = 0, (c) y 32x 8 0=9x - 72 -9x=-72 x=8 x intercept: (8, 0) 0 = 13x+169 -13x = 169 x=-13 0=32x-8 -32x=-8 x intercept: (-13, 0) x = x intercept: (0) (d) y=7x 0 = 7.x x=0 x intercept: (0,0)