Question

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

3x + 5y = 1
2x + 4y = –4
Answer
None of the above

Multiply the first equation by –2 and multiply
the second equation by –3.

Multiply the first equation by 2 and multiply the second equation by 3.

Multiply the first equation by –2 and multiply the second equation by 3.

Answer 1

Multiply the first equation by -2 and multiply the second equation by 3

Answer 2

i really dont see why any of the last three is better than the others

Answer 3

what?

Answer 4

unless i've missed something

Answer 5

so is he right?

Answer 6

well?

Answer 7

your elminating x so the last choice is the best. Although you could use other choices to eliminate the y variable, you can eliminate the x only by the last choice.

Answer 8

lets go thru them one by one
first one will give -6x in each equn. and you subtract
second ............... 6x ...............................................
third...................... -6x in first equn. and 6x in second and you add

i suppose its a bit easier to add where negatives are involved
- maybe he is right but its a dubious point