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

x = 8

Step-by-step explanation:

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

-2x + 1 = - 15

-2x = - 16

x = 8

Answer: x = 7 y = - 2

Step-by-step 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