Question

Select the best possible first step to solving the system by first eliminating the y variable:
4x – 5y = 4
3x + 2y = –20
Multiply the first equation by 2 and multiply the second equation by 5.
Multiply the first equation by –2 and multiply the second equation by 5.
None of the above
Multiply the first equation by 2 and multiply the second equation by –5.

Answer 1

Multiply the first equation by –2 and multiply the second equation by 5.

-8x + 10y = -8
15x + 10y = -100

Answer 2

the first and second options do the exact same thing and lead to the results of the last option ....

Answer 3

the only option that does absolutely nothing is the third one :)

Answer 4

none of the above