Question

Solve the following system:

y = x + 3
4x + y = 18

Your answer:


(6, 3)

(3, 6)

(−3, 6)

(3, −6)

Answer 1

B (3,6)

Explanation:

y = x + 3

then we will use this y to substitute the other y

4x + y = 18

4x + (x +3) = 18

4x + x + 3 = 18

5x = 18 - 3

5x = 15

x = 15/5 = 3

then we can find the value of y

y = x + 3 = 3 + 3 = 6

so the (x,y) is (3,6)