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30 June, 10:46

A student is trying to solve the system of two equations given below:

Equation P: a + b = 6

Equation Q: 4a + 2b = 19

Which of the following steps can be used to eliminate the a term?

-1 (4a+2b=19)

-4 (4a+2b=19)

-4 (a+b=6)

4 (a+b=6)

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Answers (1)
  1. 30 June, 10:53
    0
    I wonder why my answer was deleted. it was correct.

    so if we wanted to cancel the terms, we would try to get the smaller term to be a negative form of the bigger one

    we have the terms

    a and b and

    4a and 2b

    to cancel the b's we would have to multiply b by - 2

    to cancel the a's we would have to multiply the a's by - 4

    to keep the truth of the sentence, we have to do that to the whole equation

    so we see that there is no multiplying by - 2 but there is multiplying by - 4 so that is the answer

    the one that is : - 4 (a+b=6) is the answer
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