Question

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

4x + y = 3
5x – 2y = 7

Multiply the first equation by 2.

Multiply the second equation by 2.

Multiply the first equation by –2.

None of the above.

Answer 1

the "best" step according to who?

Answer 2

the most useful step might be the first option ....

Answer 3

wolfram alpha would be my first choice

Answer 4

Multiply the first equation by 2.

Answer 5

they want you to say the first one

Answer 6

the first is right

Answer 7

By multiplying the first equation by 2, you get
8x + 2y = 6
Then if you add this to the second equation, you get
13x = 13. Therefore, x=1
PLug that into the first equation and you get
4(1)+y=3
5+y=3
y=-2

(1,-2)