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.

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.

amistre64 · Answer

the "best" step according to who?

amistre64 · Answer

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

anonymous · Answer

wolfram alpha would be my first choice

anonymous · Answer

Multiply the first equation by 2.

anonymous · Answer

they want you to say the first one

jhonyy9 · Answer

the first is right

anonymous · Answer

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)