Question

is (2,8) a solution to the equation y = -4x

Answer 1

test your equation with x replaced with a 2
what do you get for y ?

Answer 2

\(\large {\color{brown}{ y}} = -4{\color{blue}{ x}}\qquad
\begin{cases}
(2,8)\\
{\color{blue}{ x}}=2\qquad {\color{brown}{ y}}=8
\end{cases}\quad thus\quad \square ?=-4\square ?\)

Answer 3

is (0,8) a solution to the equation y = x + 4