SOLUTION: How can i solve this system of equation by substitution of -3x-3y=3,y=-5x-7?

Question 325285: How can i solve this system of equation by substitution of -3x-3y=3,y=-5x-7?
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Start with the first equation.

Plug in into the first equation. In other words, replace each with . Notice we've eliminated the variables. So we now have a simple equation with one unknown.

Distribute

Combine like terms on the left side

Subtract 21 from both sides

Combine like terms on the right side

Divide both sides by 12 to isolate x

Reduce

Now that we know that , we can plug this into to find

Substitute for each

Multiply -5 and to get

Subtract

So the solutions are and which form the ordered pair

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