Question

What steps do need to take to solve by eliminating the x variable for the following two equations 5x-7y = –4 and 3x – 10y = –14? Here are the choices

A)Multiply the first equation by –3 and multiply the second equation by 5.

B)Multiply the first equation by 4 and the second equation by 14.

C)Multiply the first equation by –3 and multiply the second equation by –5.

D)Multiply the first equation by 3 and multiply the second equation by 5.

Answer 1

What a dumb question

Answer 2

I hate to think this is how they are teaching math these days.

Answer 3

I completely agree

Answer 4

Any of A, C, or D can be the answer depending on what _OTHER_ steps you take after that.

Answer 5

so which one is it?

Answer 6

Depends on what you are going to do after this step.

Answer 7

For C and D you'd have to perform that operation, then subtract the two equations.

Answer 8

For A you'd perform that operation, then add the two equations.

Answer 9

I suppose A and C would slightly quicker than D, but A and C are as quick as each other.

Answer 10

Nope, I misread C. A, C, and D are all pretty much the same.

Answer 11

Yeah but I need to find the step that eliminates the x variable

Answer 12

A is the best choice

Answer 13

Any of them can.

Answer 14

I disagree with your use of 'best'

Answer 15

It makes the assumption that addition is better than subtraction.

Answer 16

Your teacher probably would want you to pick A, but it's really no better than C or D.

Answer 17

I am confused all I need to find the step that eliminates only the X variable and that's all

Answer 18

None of these steps will eliminate anything.

Answer 19

Any of A, C, or D can be used in conjunction with other steps to eliminate the x.

Answer 20

The answer your teacher probably wants is A since it is different from C and D by the fact that it uses addition while they use subtraction.

Answer 21

If you cannot read and understand any of what we wrote here then I weep for the future of our species as a whole.

Answer 22

what is the first step to solving the following system by eliminating the X variable?
that is what the question asks

Answer 23

READ WHAT WE WROTE

Answer 24

A

Answer 25

Alright thank you for helping but i got the answer from someone else thanks for trying

Answer 26

Try performing each of the operations on those equations, and you should see what we mean by A, C, and D being approximately the same, with one requiring addition, and the others subtraction.

Answer 27

I got it thank you for your help

Answer 28

Dalvoron, I think you're giving far too much credit to this student's willingness to learn anything.

Answer 29

Excuse me?

Answer 30

Mayhaps, but as a teacher in training, I fear I must do all I can.

Answer 31

Oh now you understand what I wrote?

Answer 32

Yeah I do and I thanked you for your help you don't need to comment about it