Question

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

3x + y = 6
x + 2y = –13

Multiply the first equation by 2.
Multiply the second equation by 2.
Multiply the first equation by –2.
None of the above.

Answer 1

solve for y in the first equation. subtract 3x from both sides

Answer 2

Multiply the first eq by 2.

so you will get \[6x + 2y = 12, x + 2y = -13\]

Answer 3

then subtract the second from the first, you will get : \[5x = 25, \therefore x = 5. \]

Answer 4

then put x in the ORIGINAL eq, so you will get: \[2y = -18, \therefore y = -9\]

Answer 5

wrong it wants to eliminate y first not x. solve for y in the first then use that to substitute into the second equation.

Answer 6

dudee. i eliminated y. you can't see y when it's gone, or as aptly put, eliminated.

Answer 7

y=6-3x, x+2(6-3x)=-13. the question says eliminate y first. you eliminated x first.

Answer 8

your final answer was correct but you failed to read the question correctly.

Answer 9

nononononon. see this. you are using the subsitution method, he asked for the elimination method:

see that there??? that, is y being taken out, or eliminated.