Question

Solve by substation x+y=4 and x+2y=13

Answer 1

\(x+y=4\) is the same as \(y=4-x\) put \(4-x\) where you see \(y\) in the second equation and get
\[x+2(4-x)=13\] then solve it for \(x\)

Answer 2

Ok thank you

Answer 3

or you can start with \(x=4-y\) and make the second equation
\[4-y+2y=13\] and solve for \(y\)
that might be even easier