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Which expression has a value of 36 when x=4 and y=7 A. 2xy B. 2x+4y C. 6y-x D. 12x-2y
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Which expression has a value of 36 when x=4 and y=7 A. 2xy B. 2x+4y C. 6y-x D. 12x-2y
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Nov 10, 2017
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Which expression has a value of 36 when x=4 and y=7 A. 2xy B. 2x+4y C. 6y-x D. 12x-2y
Mathematics
middle-school
Paul Hunt
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the answer is b, because 2x4 is 8, 4x7 is 28 and 8+28+36
Sonu Jha
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Nov 12, 2017
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Sonu Jha
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so subsitute
x=4y=7
A. 2xy=2 times 4 times 7=2 times 28=56 not 36
B. 2x+4y=2 times 4+4 times 7=8+28=36 true
the answer is B
Mark Peters
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Nov 14, 2017
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Mark Peters
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