Final answer:
The value given by y = 2 - 7 is y = -5, but this does not satisfy the first equation 20 = 17 - 5y. Hence, there is no consistent value of y that satisfies both equations.
Step-by-step explanation:
The student is asking what the value of y is that satisfies the system of equations:
To find the value of y, we can first solve the second equation directly:
y = 2 - 7
y = -5
Now that we have the value of y, we can check if this value satisfies the first equation:
20 = 17 - 5(-5)
20 = 17 + 25
20 = 42
This is not true, which means that y = -5 does not satisfy the first equation. Therefore, there is an error, and these two equations do not form a consistent system. In other words, there is no value of y that satisfies both equations simultaneously.