Question

X + y = -34x + 4y = - 12.Solve the system of linear equations by graphing

Answer 1

We write out and number the equations

`\begin{gathered} x+y=-3--------------------(1) \\ 4x+4y=-12------------------(2) \\ From\text{ equation (1), we have:} \\ y=-x-3 \\ \text{From equation(2)} \\ 4x+4y=-12 \\ 4y=-12-4x \\ \Rightarrow(4y)/(4)=(-12-4x)/(4) \\ \Rightarrow y=-x-3 \end{gathered}`