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I need help knowing what the difference is :
Select the best possible first step to solving the following system by first eliminating the y variable.
5x3y=1
7x4y=2
My options are to:
Multiply the first equation by 3 and multiply the second equation by 4.
Multiply the first equation by 3 and multiply the second equation by 4.
Multiply the first equation by 7 and multiply the second equation by 5.
None of the above.
My instinct is to multiply the equations by either 3 and 4 or 3 and 4, but I don't know what the difference is in multiplying by a negative or a positive.
 one year ago
 one year ago
I need help knowing what the difference is : Select the best possible first step to solving the following system by first eliminating the y variable. 5x3y=1 7x4y=2 My options are to: Multiply the first equation by 3 and multiply the second equation by 4. Multiply the first equation by 3 and multiply the second equation by 4. Multiply the first equation by 7 and multiply the second equation by 5. None of the above. My instinct is to multiply the equations by either 3 and 4 or 3 and 4, but I don't know what the difference is in multiplying by a negative or a positive.
 one year ago
 one year ago

This Question is Closed

lilg132Best ResponseYou've already chosen the best response.1
are you sure you wrote the options correctly?
 one year ago

mathstudent55Best ResponseYou've already chosen the best response.0
In elimination, you want to add or subtract the equations to eliminate one variable, here it's y. Your instinct is correct, but you have to be careful which equation you multiply by what. You want 12y or 12 y. The first equation should be multiplied by 4 or 4 and the second by 3 or 3. Notice they give you 3 with the second eq and 4 with the first one. That will not help. 5 and 7 would help eliminate x not y.
 one year ago

lilg132Best ResponseYou've already chosen the best response.1
which is why i think the question or options are wrong
 one year ago

Arieln7s96Best ResponseYou've already chosen the best response.1
Right, and i would think it would be 3 and 4 so I'm going to go ahead and go with none of the above
 one year ago

lilg132Best ResponseYou've already chosen the best response.1
either the question should be eliminate x first or the option should have multiply first equation by 4 and second by 3 or multiply first equation by 4 and second by 3 or something like that
 one year ago

lilg132Best ResponseYou've already chosen the best response.1
oops i didnt even see none of the above so yes thats the answer
 one year ago

ChmEBest ResponseYou've already chosen the best response.0
definitely non of the above. You're correct
 one year ago

ChmEBest ResponseYou've already chosen the best response.0
It's tough to answer these questions without knowing if they want to eliminate by addition or subtraction. Subtraction the coefficients should have the same sign. Addition they should be opposite.
 one year ago
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