O eliminate the y-terms and solve for x in the fewest steps, by which constants should the equations be multiplied? First Equati

Question

3 years ago

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O eliminate the y-terms and solve for x in the fewest steps, by which constants should the equations be multiplied? First Equati

on: 5x − 4y = 28 Second equation: 3x - 9y = 30
A.The first equation should be multiplied by 3 and the second equation by 5.B.The first equation should be multiplied by 3 and the second equation by −5.C.The first equation should be multiplied by 9 and the second equation by 4.D.The first equation should be multiplied by 9 and the second equation by −4.

Mathematics

1 answer:

IceJOKER [234] · Answer 1 · 2022-04-26T17:52:46+03:00

"<span>D.The first equation should be multiplied by 9 and the second equation by −4." makes sense. Let's do this work:

</span><span>First Equation: 5x − 4y = 28 Second equation: 3x - 9y = 30

45x - 36y = 252
-12x+36y = -120
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33 x = 132, so x = 4. And so on.</span>