Solve by addition or substitution method?

x-4=9

2x-3y=11

To solve this I will use substitution method.

First we need to find x so

X - 4 = 9

X - 4 (+4) = 9 (+4)

X = 13

Now we can substitute 13 where there is an x in the second equation so instead of

2x - 3y = 11 it would be

2 (13) - 3y = 11

Now

26 - 3y = 11

26 (-26) - 3y = 11 (-26)

-3y = - 15

Y = 5

To prove our answer we can do 2 (13) - 3 (5) = 11 which is 26 - 15 = 11

X = 13

Y = 5