Equation A: 3c = d − 8 Equation B: c = 4d + 8 Which of the following steps should be performed to eliminate variable d first?

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08-08-2017
Mathematics

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Equation A: 3c = d − 8 Equation B: c = 4d + 8 Which of the following steps should be performed to eliminate variable d first?

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texaschic101 texaschic101 · Answer 1 · 2017-08-08T04:32:58+02:00

texaschic101 texaschic101

08-08-2017

3c = d - 8 ....multiply by -4
c = 4d + 8
--------------
-12c = -4d + 32 (result of multiplying by -4)
c = 4d + 8
-------------add
-11c = 40.....as u can see, the d's have been eliminated

answer : multiply equation A by -4

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