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Answer:
a = 4
Step-by-step explanation:
If two lines y = 4x - 5 and y = ax + (-) 2 are parallel, then their gradeints are equal.
y = 4x - 5 has gradient of 4 ( comparing with the general equation y = mx + c).
Also, the gradient of y = ax + (-) 2 is a.
Since the lines are parallel then
a = 4