Question

What is the solution of the system?

x + 2y = 3
2x + y = -9
(5,-7)
(-1,5)
(5, -1)
(-7.5)

Answer 1

Answer: (5,-7)

Explanation:

x + 2y = 3.... eqn 1

2x + y = -9....eqn 2

eqn 1 make x subject of formula

x = 3- 2y

eqn 2 make x subject of formula

x = -9-y/2

solve for y

3- 2y=-9-y/2

y=5

subsitute y in eqn 1

x=-7