a) If x increases by 1 unit, what is the corresponding change in y?
b) If x decreases by 2 units, what is the corresponding change in y?
y = 4x - 3 ...(1)
a) If x increases by 1 unit, what is the corresponding change in y?
Let dy be the change in y. Then y + dy = 4(x + 1) - 3 or y + dy = 4x + 1 ...(2)
Subtract equation (1) from equation (2) to find dy.
b) If x decreases by 2 units, what is the corresponding change in y?
Again let dy be the change in y. Then y + dy = 4(x - 2) - 3 or y + dy = 4x -11 ...(3)
Subtract equation (1) from equation (3) to find dy
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