In the equation y=mx+b, is x the x-intercept?
by 
Surgeon General
ANSWERS: 1
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No. The x-intercept is the place where the line meets the x-axis; you find it by setting y=0: 0=m*x+b, so x = -b/m. So the x-intercept is -b/m (or the point (-b/m, 0) on the x-axis). The y-intercept is the place where the line meets the y-axis; you find it by setting x=0: y= m*0+b = b. So the y-intercept is b (or the point (0,b) on the y-axis). For example, if you consider the line y=3x-1, the x-intercept will by 1/3, and the y-intercept is -1.
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