Question

Solve each system by the addition method.

x + 2y = -1
5x - 4y = 16
Put your answer in ordered pair (x, y) DECIMAL form.

Answer 1

(x, y) = (2, -1.5)

Explanation:

x + 2y = -1

5x - 4y = 16

<=>

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

5x - 4y = 16

<=>

2x + 4y = -2

5x - 4y = 16

<=>

7x = 14

<=>

x = 2

(*)x + 2y = -1

=> 2 + 2y = -1

=> 2y = -3

=> y = -1.5

=> (x, y) = (2, -1.5)