Solve each system using substitution. Check your answer
x+3=y
3x+4y=7

It would be:

(-5/7,16/7)

x=-5/7, y=16/7

Step-by-step explanation:

Solve for the first variable in one of the equations, then substitute the result into the other equation.

x = -5/7

y = 16/7

Step-by-step explanation:

3x + 4y = 7

3x + 4(x+3) = 7

3x + 4(x) + 4(3) = 7

3x + 4x + 12 = 7

7x + 12 = 7

7x + 12 - 12 = 7 - 12

7x = -5

7x ÷ 7 = -5 ÷ 7

x = -5/7

x + 3 = y

(-5/7) + 3 = y

16/7 = y

3x + 4y = 7

3(-5/7) + 4(16/7) = 7

-15/7 + 64/7 = 7

7 = 7

the answer is d. (1.2, -4.7) on edgn

hope this !

10+4√2 is the answer. i dont have the time to explain.