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If c = 4x + 5 and r = 21 - 2x, then for what value of x is c = r? A.
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04 Nov 2021, 06:30
04 Nov 2021, 06:30
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If c = 4x + 5 and r = 21 - 2x, then for what value of x is c = r?
A. 3/8
B. 8/3
C. 13/3
D. 8
E. 13
A. 3/8
B. 8/3
C. 13/3
D. 8
E. 13
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Re: If c = 4x + 5 and r = 21 - 2x, then for what value of x is c = r? A.
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04 Nov 2021, 07:39
04 Nov 2021, 07:39
Carcass wrote:
If c = 4x + 5 and r = 21 - 2x, then for what value of x is c = r?
A. 3/8
B. 8/3
C. 13/3
D. 8
E. 13
A. 3/8
B. 8/3
C. 13/3
D. 8
E. 13
We want to make the equation c = r true.
Substitute their equivalent values to get: 4x + 5 = 21 - 2x
Subtract 5 from both sides of the equation: 4x = 16 - 2x
Add 2x to both sides of the equation: 6x = 16
Solve: x = 16/6 = 8/3
Answer: B
gmatclubot
Re: If c = 4x + 5 and r = 21 - 2x, then for what value of x is c = r? A. [#permalink]
04 Nov 2021, 07:39
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