Question

y = 10 when x = - 4 , find y when x = 12

Answer 1

Answer:

y = -30

Step-by-step explanation:

Set the ratio: $\frac{x_1}{y_1} = \frac{x_2}{y_2}$

Let:

$(x_1 , y_1) = (-4 , 10)\\(x_2 , y_2) = (12 , y)$

Plug in the corresponding terms to the corresponding variables:

$\frac{-4}{10} = \frac{12}{y}$

First, cross multiply.

$(-4 * y) = (10 * 12)\\-4y = 10 * 12\\-4y = 120$

Next, isolate the variable, y. Divide -4 from both sides of the equation:

$\frac{-4y}{-4} = \frac{120}{-4}\\y = \frac{120}{-4}\\y = -30$

-30 is your answer for y.