y=3 cos pi x

Question

I know that the answer is 2 but can you show the steps on how to get there

Answer 1

y = 3 cos (πx)

y = 3 (cos π)(x)

y = 3 (-1)(x)

y = -3x

y = -3(1)

y = -3

y = 2 (since -3 + 5 = 2)