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nisha87
10.04.2020 •
Mathematics
Which fraction does not belong? Why? Could there be another? 3/4, 2/6, 4/10, 3/8
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Ответ:
-12x-4y=36
Step-by-step explanation:
First, determine which variable will be eliminated. Next, consider how to create additive inverses with the coefficients on that variable by multiplying one of the two equations by a constant number.
To eliminate x by changing the first equation, the additive inverse of the coefficient of x in the second equation is needed. This is obtained by multiplying the first equation by 2 to get a coefficient of -6, the additive inverse of 6.
To eliminate x by changing the second equation, the additive inverse of the coefficient of x in the first equation is needed. This is obtained by multiplying the second equation by to get a coefficient of 3, the additive inverse of -3.
To eliminate y by changing the first equation, the additive inverse of the coefficient of y in the second equation is needed. This is obtained by multiplying the first equation by to get a coefficient of -2, the additive inverse of 2.
To eliminate y by changing the second equation, the additive inverse of the coefficient of y in the first equation is needed. This is obtained by multiplying the second equation by -2 to get a coefficient of -4, the additive inverse of 4.
Any of these four procedures can be used to begin the solving process. Once applied, the sum of the new equation and the unchanged equation from the original system is an equation of one variable.