Triple both sides of the first equation; them add it to the last equation. That will get rid of the y term.
3x + 9y = 18
2x - 9y = 7
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5x = 25
Surely you can take it from there.
Once you know x, use either equation to solve for y. They will give the same answer.
x+3y=6
2x-9y=7
can you please help me im getting the wrong answers.
thank you
3 answers
well the answer is not 5 it is x=11 and y=-5/3
11 + 3*(-5/3) = 6, which is OK, but
2*11 -9*(-5/3) = 22 + 15 = 37, not 7
Either your "book" answer is wrong or you copied the problem incorrectly.
If the second equation were
2x + 9y = 7,
you get the answers you quoted.
2*11 -9*(-5/3) = 22 + 15 = 37, not 7
Either your "book" answer is wrong or you copied the problem incorrectly.
If the second equation were
2x + 9y = 7,
you get the answers you quoted.