A linear function is represented by a straight line on a graph in the form y = mx + b. The linear functions in the given options are y = -3x, y = 0.2 + 0.74x, and y = -9.4 - 2x.
Step-by-step explanation:
A linear function is a function that can be represented by a straight line on a graph. To determine if a function is linear, we need to check if the equation is in the form y = mx + b, where m is the slope and b is the y-intercept.
Based on the given options, the linear functions are:
y = -3x
y = 0.2 + 0.74x
y = -9.4 - 2x
These functions are linear because they can be written in the form y = mx + b. The other options are not linear because they contain terms with exponents or decimals.