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23 Feb 2017, 06:30
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
87% (00:49) correct
13%
(00:59)
wrong
based on 285
sessions
History
Date
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x=1−2y, and 5x+10y+z=5. What is the value of z?
A. -5
B. 0
C. 5
D. 10
E. The answer cannot be determined from the data provided.
A. -5
B. 0
C. 5
D. 10
E. The answer cannot be determined from the data provided.
23 Feb 2017, 09:20
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Bunuel
Given: x = 1 - 2y
Add 2y to both sides to get: x + 2y = 1
Given: 5x + 10y + z = 5
Notice that we have x + 2y "hiding" in this expression.
Rewrite the first two terms as follows: 5(x + 2y) + z = 5
Replace x + 2y with 1 to get: 5(1) + z = 5
Simplify: 5 + z = 5
Solve: z = 0
Cheers,
Brent
General Discussion
23 Feb 2017, 06:36
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z = 5 - 5x - 10y
substitute x = 1-2y in the above equation.
z = 5-5+10y-10Y = 0
Option B
substitute x = 1-2y in the above equation.
z = 5-5+10y-10Y = 0
Option B
