Question

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A function with an input of 3 has an output of 5 which of the following could not be function equation?
y = 2x - 1

y = x + 2

y = 3x - 4

y = x - 2

Answer 1

y = x - 2 could not be the function equation.

Explanation:

The function with an input of 3 has an output of 5.

So, y = 2x - 1 can be the function as y(3) = 2 × 3 - 1 = 6 - 1 = 5.

Now, y = x + 2 can also be the function as y(3) = 3 + 2 = 5

Again, y = 3x - 4 can also be the function as y(3) = 3 × 3 - 4 = 9 - 4 = 5

But y = x - 2 can not be the function as y(3) = 3 - 2 = 1 ≠ 5

Therefore, y = x - 2 could not be the function equation. (Answer)