Question

Solve the system by substitution.
2x+y=-11
3x-4y=11

Answer 1

USE MATRIX TO SOLVE THE EQATION(S)

Answer 2

Substitution ^^

Answer 3

Havent seen Substitution

Answer 4

2x+y=-11

2x = -11 -y

x = -(11+y)/2

Answer 5

substitute this in eq 2 and find y

Answer 6

\[y = -11 -2x\]So,\[\begin{align}3x - 4(-11 - 2x) & = 11 \\ 3x+44 +8x&=11 \\ 11x + 44&=11\\ 11(x + 4)&=11\\x+4&=1\\x&=-3\end{align}\]