Question

How to solve this system of equations ?

3x = y
y + 7x = 10

Answer 1

x = 1, y = 3

Explanation:

easy

Answer 2

x = 10, y = 30

Explanation:

Since this already has a y-value, which is 3x, we will use substitution.

3x + 7x = 10

10x = 10

x = 10

Now that we know x, we can figure out what y is.

y = 3(10)

y = 30