Question

please solve for Y:
x+3y=13
2x-y=-9

Answer 1

Let say:
x+3y=13---- No.1
2x-y=-9 -----No.2

From No.2
y=2x+9---- No.3

Sub y=2x+9 into No.1
x+3(2x+9)=13
x+6x+27=13
7x=13-27
=-14
x=-14/7
=-2

Sub x=-2 into No.3
y=2(-2)+9
=9-4
=5:)

Try it out! Good luck!