Question

Find the value of x when y = 16.y = -5x + 4x = ?

Answer 1

$y=-5x+4$

To find the value of x when y=16. Substitute in the equatio the y for 16:

$16=-5x+4$

Solve x:

-Subsrtact 4 in both sides of the equation

$\begin{gathered} 16-4=-5x+4-4 \\ 12=-5x \end{gathered}$

-Divide both sides of the equation into -5:

$\begin{gathered} \frac{12}{-5}=\frac{-5}{-5}x \\ \\ -\frac{12}{5}=x \end{gathered}$Then, when y is 16, x is -12/5 or -2.4