Question

Select the best possible first step to solving the system by first eliminating the x variable.

4x + 9y = 21
3x – 8y = 1

Multiply the first equation by 3 and multiply the second equation by 4.

Multiply the first equation by –3 and multiply the second equation by –4.

Multiply the first equation by 8 and multiply the second equation by 9.

None of the above

Answer 1

Filing this under "Math" would be your first step.
It is however the third step as it would make all the numbers more manageable, the first two would do nothing.