Question

Which ordered pair is the solution to the system of equations?

S-3x + 4y = -20
- 4
(0, - 5)
(-4, - 8)
(4,8)
(-2, – 6)

Answer 1

You can use Gaussian Elimination.

Double both sides of the first equation and add the second equation.

6x + 4y = 8

5x - 4y = 3

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11x = 11

x = 1

5 - 4y = 3

-4y = -2

y = 1/2

Explanation: