SOLUTION: hi,I have a problem solving this equation: 3p+q=11 p+q=7 santelle

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Question 160409: hi,I have a problem solving this equation: 3p+q=11
p+q=7
santelle

Answer by Earlsdon(6294)   (Show Source): You can put this solution on YOUR website!
Solve the "system of equations":
This is quite straightforward, you just have to mind your p's and q's (lol)

Rewrite this equation as: and substitute for p into the first equation.
Simplify this and solve for q.
Combine like-terms.
Subtract 21 from both sides.
Finally, divide both sides by -2.
Now substitute this for q into the second equation and solve for p.
Subtract 5 from both sides.

The solution is: p = 2 and q = 5

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