Question

Solve the system of equations using elimination/ combinations.
-2x - y= -4
x+ 2y = 5

Answer 1

If
`-2x-y=-4` and
`x+2y=5`, notice that

`(-2x-y)+2(x+2y)=-4+2\cdot5\implies3y=6\implies y=2`

Then

`x+2\cdot2=5\implies x=1`