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Which number should be multiplied by the second equation to eliminate a variable through adding?

Which number should be multiplied by the second equation to eliminate a variable through-example-1
User C Abernathy
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1 Answer

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Looking at the second equation, the coefficient of the variable x is -2.

Since the coefficient of x in the first equation is 4, we would need a coefficient of -4 in the second equation in order to cancel them.

We already have -2, so to have -4, we need to multiply the second equation by 2.

The coefficient of y is 3 and in the second equation is -1, so we would need to multiply the equation by 1/3 in order to cancel them.

So the correct option is the third one.

User Ranny
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