x4=z
yx=8
8z=t
For the system of equations given, what is the value of z?
(1) x = 7
(2) t = 5
OA D
Source: Official Guide
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Target question: What is the value of z?BTGmoderatorDC wrote:i) x  4 = z
ii) y  x = 8
iii) 8  z = t
For the system of equations given, what is the value of z?
(1) x = 7
(2) t = 5
Statement 1: x = 7
Scanning the three given equations, we see that equation i is all we need to determine the value of z
i) x  4 = z
Replace x with 7 to get: 7  4 = z
So, z = 3
Since we can answer the target question with certainty, statement 1 is SUFFICIENT
Statement 2: t = 5
Scanning the three given equations, we see that equation iii is all we need to determine the value of z
iii) 8  z = t
Replace t with 5 to get: 8  z = 5
So, z = 3
Since we can answer the target question with certainty, statement 2 is SUFFICIENT
Answer: D
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