Question

Use substitution to find the value of y for this set of equations.
12x - 5y = 30
y = 2x - 6

Answer 1

Sub in y:
\[\Large 12x-5(2x-6)=30\]

Now solve for x.

Answer 2

To use substitution, we must first isolate x or y in either of the equations. What is awesome here, is y is isolated already in the 2nd equation!!!

y = 2x - 6

So! Let's just plug in the 2x - 6 into the y of the first equation.

12x - 5y = 30; And we know y = 2x - 6 So,\[12x - 5(2x-6) = 30\]

Now solve for x!

Answer 3

Do you know what to do now? @MyShoeGameIsMagic

Answer 4

yes thanks!

Answer 5

Of course bud!