Need those done by 33 minutes you have to use system of equations substitution thank you

1. y=4

y=x+7

4=x+7

x= -3 , y= 4

2. y=3x

y=x+5

3x=x+5

2x=5

x=5/2 or 2.5

y= 3(5/2)

y= 15/2 or 7.5

x= 2.5, 7= 7.5

1. x= -3           2. x= 5/2

Step-by-step explanation:

You need to substitute the second y equation given into the first one to find x. Then get x by itself on one side.

1. 4= x + 7

  -7       -7

  -3 = x

  x= -3

2. 3x= x + 5

   -x    -x

   2x= 5

  (2x= 5) /2

   x= 5/2

15 units use socratic

step-by-step explanation: 15 units