Question

If y=1.8 when x=-0.18 what is y when x= 0.51

Answer 1

You can set it as a proportion:

$\frac{x_1}{y_1} = \frac{x_2}{y_2}$

$\frac{-0.18}{1.8} = \frac{0.51}{y_2}$

Cross multiply:

-0.18y = 0.918

Divide:

y = -5.1