Question

Solve the linear system.
x + y = -3
y = 2x


(-1, -2)
no solution
coincident

Answer 1

y = 2x
so sub 2x in for y in the other equation
x + y = -3
x + 2x = -3
3x = -3 --- divide by 3
x = -1

y = 2x
y = 2(-1)
y = -2

solution is (-1,-2)

Answer 2

Thanks