Question

How to solve this system of equation using substitution 3x+y=15
y=2x

Answer 1

x=3

Explanation:

Substitute y with 2x meaning that your equation is now: 3x+2x=15

Now you combine like terms: 5x=15

Next, you isolate the variable by dividing both sides by 5.

Your final should be x=3

Answer 2

x = 3

Explanation:

3x + y = 15

Using substitution

3x + 2x = 15

5x = 15

x=3