Solve the following system of equations using matrices

Question

x = -2y + 6
2x + 2y = 16

Answer 1

1 2 6
1 1 8

1st - 2nd

1 2 6
0 1 -2

1st - 2x2nd

1 0 10
0 1 -2

so x = 10
y = -2

(using matrices to solve this simple system is like using a sledge-hammer to crack a peanut.
Substitution would have been so easy)