Math
posted by Forward 27 .
A student used points (150,80) and (50,30) but wrote the equation y=5x + 0.5. What mistake did the student make?

Use:
(yy1)=(xx1)(y2y1)/(x2x1)
Substitute (x1,y1)=(50,30) and (x2,y2)=(150,80).
When you get the right answer, the mistake is obvious. And simple.