SOLUTION: how do i solve 9x-2y=3 3x-y=6 using substitution

SOLUTION: how do i solve 9x-2y=3 3x-y=6 using substitution

Algebra.Com

Question 769999: how do i solve
9x-2y=3
3x-y=6
using substitution
Answer by kmadison(20) (Show Source): You can put this solution on YOUR website!
so 1st lets solve the 2nd equation for y:

now we plug in for y in the 1st equation:

now we solve for x:
1st: Rewrite the expression:
2nd: Combine like terms:

now going back to the 1st expression we can plug in -3 for x:

so our final result is (-3, -15) which we can verify in both expressions:

and

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