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What should be the first step in adding these equations to eliminate y? 12x-2y=-1 + 4x+6y=-4

What should be the first step in adding these equations to eliminate y? 12x-2y=-1 + 4x-example-1
User Marysabel
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2 Answers

3 votes

Answer:

Multiply the top equation by 3

Explanation:

User CaKa
by
7.9k points
4 votes

Answer:

(A) Multiply the top equation by 3

Explanation:

The given equations are:


12x-2y=-1 (1)

and
4x+6y=-4 (2)

Now, multiplying equation (1) by 3, we get


36x-6y=-3

Also, adding the above equation with equation (2), we get


36x-6y+4x+6y=-3+(-4)


40x=-7


x=-(7)/(40)

Thus, on multiplying the top equation by 3, we can eliminate y easily.

Hence, option (a) is correct.

User Cesc
by
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