Question

3x + y = 0 x - y = 4use the substitution method to solve the linear equation.

Answer 1

Consider the equation x-y=4 and express y in terms of x.

$\begin{gathered} x-y=4 \\ y=x-4 \end{gathered}$

Put x-4 for y in the equation 3x+y=0 implies,

$\begin{gathered} 3x+x-4=0 \\ 4x=4 \\ x=1 \end{gathered}$

The, the value of y is,

$\begin{gathered} 1-y=4 \\ y=-3 \end{gathered}$

Thus, x=1 and y=-3