Question

This figure shows y=f(x), the graph of the function f. If the function g is defined as g(x)= 2•f(x)-1, what is the value of g(1)?

Answer 1

This is a nice twist to see if you can read the graph and interpret what it means.

f(1) is the y value of the graph when x = 1

So start at x = 1 and find the y value. Go straight up. The point you reach is (1,3)

so g(1) = 2*f(1) - 1

g(1) = 2*3 - 1

g(1) = 5

Answer

g(1) = 5