-3x - y = 15
y = -8x
(x, y) = (0
)
9,0

Solution:

Given system of equations are:

-3x - y = 15 eqn 1

y = -8x eqn 2

We have to find solution of (x, y)

We can solve by substitution method

Substitute eqn 2 in eqn 1

-3x - (-8x) = 15

-3x + 8x = 15

5x = 15

Divide both sides by 5

Substitute x = 3 in eqn 2

y = -8(3)

Thus solution is (x, y) = (3, -24)