Question

What is x+3y+1 -3x-3y=-15 by using substitution

Answer 1

Answer: x = 7 y = -2

Explanation:

Assuming you meant x + 3y= 1 and -3x - 3y = -15.

Take the first eq and solve it to x= 1 - 3y. Then take that into the 2nd eq.

-3(1 - 3y) - 3y = -15

-3 + 9y -3y = -15

-3 + 6y = -15

6y = -12

y = -2

Take that into first eq

X + 3(-2) = 1

X + -6 = 1

X = 7

(7, -2) is the answer

Answer 2

x = 8

Explanation:

x + 3y + 1 -3x - 3y = -15 (+3y will eliminate -3y)

-2x + 1 = -15

-2x = -16

x = 8