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put this solution on YOUR website!You should use substitution to solve this problem. Since you know y=x+7, every time you see a y in the first equation, you can plug in x+7 in for that y. Think of it like a code that you are solving...
When you substitute that in, your top equation now looks like:
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To solve this equation, you will need to use the distributive property to distribute the 3 across the (x+7). The new equation looks like:
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Now, combine like terms to make the equation
. Move the 21 over to the other side by subtracting it from both sides of the equal sign, which gives you:
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Divide by 5 on both sides to solve.
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Now that you know x=2, you can plug x into either equation to solve for y. It is probably easier to put it into the bottom equation since that is the "easier" one.
So, y = 2 + 7. y = 9.
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