How can you use substitution method to solve a system of equations that does not have a variable with a coefficient of 1 or - 1?

You can multiply or divide one equation so that it has a variable with a coefficient opposite of the other equation.

Example:

A) 2x + 3y = 6

B) 4x + 2y = 20

Notice that neither equation has a "1" or "-1"

Let's multiply Equation A) by - 2

A) - 4x - 6y = - 12 Then add it to B)

B) 4x + 2y = 20

-4y = 8

y = - 2

A) 2x + 3*-2 = 6

2x = 12

x = 6