Find f(3) for the function in the Table
| x | -4 | -1 | 0 | 2 |
|f(x)| -5 | 1 | 3 | 7 |
Now check the equations below. Which of them has g(3) = the f(3) you just found?
Answers:
a) g(x) = 5x - 6
b) g(x) = 2x + 5
c) g(x) = 3x - 7
d) g(x) = 4x - 1
Sketch a graph
looks like a line
try slope = m = (7-3)/2 and b =3 because y = 3 when x = 0
so y = 2 x + 3 (check some other point)
if x = 3 then y = 6 + 3 = 9
then g(3) = 9?
15 - 6 is indeed 9 so a