So y=x-1 and 2x+y=8 Substitute y=x-1 in for y 2x+(x-1)=8 Simply = 3x -1=8 Bring the one to the other side 3x=9 Divide X=3 Plug x into y=x-1 Y=(3)-1 Y=2 Check with the other equation 2(3)+(2)=8 6+2 =8
X=3 Y=2
You can also do elimination. Y=x-1 and 2x+y=8 Subtract c from the first equation -x+y=-1 and 2x+y=8 Those are your equations.
-1(-x+y)=-1 = x-y=1 2x+y=8 The y’s would cancel and you would add down so this is your new equation 3x=9 X=3 You then plug in the 3 for x And find y Y=(3)-1 Y=2
