Question

3.
Solve the following system of equation by the substitution method
x + 2y - 7 = 0
2x - y - 11 = 0​

Answer 1

Answer:

3x+2y=7

4x+y=6⇒y=6−4x

placing in equation (1)

3x+2(6−4x)=7

3x+12−8x=7⇒−5x+12=7

−5x=7−12⇒−5x=−5

x=1

∴ y = 6 - 4×1=2

∴ x = 1, y = 2

solution