Question

Solve the following system:

y = x + 3
4x + y = 18


(6, 3)

(3, 6)

(−3, 6)

(3, −6)

Answer 1

B. (3, 6)

Explanation:

y = x + 3

4x + y = 18

4x + x + 3 = 18

5x = 18 - 3

5x = 15

x = 3

y = x + 3 = 3 + 3 = 6

(3, 6)

Answer 2

B (3 ; 6)

Explanation:

y = x + 3

4x + y = 18

4x + x + 3 = 18

5x = 18 - 5

5x = 15

x = 15 : 5

x = 3

y = x + 3

y = 3 + 3

y = 6