Question

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

Answer 1

Answer:

Multiply the top equation by 3

Step-by-step explanation:

Answer 2

Answer:

(A) Multiply the top equation by 3

Step-by-step 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

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

⇒$40x=-7$

⇒$x=-\frac{7}{40}$

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

Hence, option (a) is correct.