Question

Express y in terms of x. Then find the value of y when x= -15 - y = 3xY in terms of x:Y=

Answer 1

first solve y

$\begin{gathered} 5-y=3x \\ 5-y-5=3x-5 \\ -y=3x-5 \\ (-1)\times-y=(-1)\times(3x-5) \\ y=-3x+5 \end{gathered}$

now replace x=-1

$\begin{gathered} y=-3(-1)+5 \\ y=3+5 \\ y=8 \end{gathered}$