The following functions represent the output (y) and input (x):
Function 1: y=2x+3
Function 2: y=2x3+3
Function 3: y=3x2−3
Function 4: Between x = 0 and x = 5,
slope = 4. After x = 5,
slope keeps increasing.
Function 5: Between x = 0 and x = 6,
slope = 2.5. For all values of
x ≥ 7, slope = 2.5
How many functions of the given ones are linear?