Solve the following system by substitution.

y = - 3x + 11
5x + y = 21

x = 5 and y = -4

Step-by-step explanation:

y = - 3x + 11 (1)

5x + y = 21(2)

Substitute (1) into (2).

5x + (-3x + 11) = 21

5x - 3x + 11 = 21

2x = 21-11

2x = 10

x = 10/2

x = 5

Now substitute x = 5 into (1).

y = -3(5) + 11

y = -15 + 11

y = -4

Hence, x = 5 and y = -4

i just took the test, the correct answer is .. 31.5 in.

im guessing (23,14). hope this : )