Question

The graph shows the proportional relationship. Derive the equation of the line y=mx
𝑦
=
𝑚
𝑥
through the origin.
(2, 10) (1, 5)

Answer 1

Slope m = (10 − 5)/(2 − 1) = 5, so the proportional line is y = 5x.

(Check: (1,5) → y=5·1=5, (2,10) → y=5·2=10.)