Solve each system of equations graphically, and check y=2x +5y= x + 4

I will be using the substitution method
y=2x+5  
y=x+4     

because y=y and they are the same,
2x+5=x+4
-5          -5

2x=x-1
-x     -x

x=-1
then plug in
y=2x+5
y=2(-1)+5
y=-2+5
y=3

y=x+4
y=(-1)+4
y=3
the answers are the same, that is the check

8-2x+3x2=6 and six is your answer