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What is 3x plus 6y equals 42 and -7x plus 8y equals -109 please use elimination and show work Thanks?
Wiki User
∙ 13y ago
4(3x+6y = 42)
3(-7x+8y = -109)
Multiply all terms in the top equation by 4 and in the bottom by 3:
12x+24y = 168
-21x+24y = -327
Subtract the bottom equation from the top remembering that a minus from a minus is equal to a plus:
33x = 495
Divide both sides by 33:
x = 15
Substitute the value of x into the original equations to find the value of y:
Therefore: x = 15 and y = -1/2
Wiki User
∙ 13y ago
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Unfortunately, limitations of the browser used by Answers.com means that we cannot see most symbols. It is therefore impossible to give a proper answer to your question. Please resubmit your question spelling out the symbols as "plus", "minus", "equals", "squared", "cubed" etc.There are no equals signs and so no equations to plot!Unfortunately, limitations of the browser used by Answers.com means that we cannot see most symbols. It is therefore impossible to give a proper answer to your question. Please resubmit your question spelling out the symbols as "plus", "minus", "equals", "squared", "cubed" etc.There are no equals signs and so no equations to plot!Unfortunately, limitations of the browser used by Answers.com means that we cannot see most symbols. It is therefore impossible to give a proper answer to your question. Please resubmit your question spelling out the symbols as "plus", "minus", "equals", "squared", "cubed" etc.There are no equals signs and so no equations to plot!Unfortunately, limitations of the browser used by Answers.com means that we cannot see most symbols. It is therefore impossible to give a proper answer to your question. Please resubmit your question spelling out the symbols as "plus", "minus", "equals", "squared", "cubed" etc.There are no equals signs and so no equations to plot!
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