Identifying Dependents and Indenpendts Variables
1) Examining the function y=45 +12x
• The input of a function is the, independent, variable
Because it depends on the value of the x, that's why you can freely choose the values you plug into for x.
• The ,output, of a function is the dependent variable.
In other words, the value of y always depends on what you plug into x.
• If x=3, y = 45 +12(3) ⇒ y = ,81
• If x = -4 y = 45+12(-4) ⇒ y = ,-3
• The value of y depends on the ,value of x
So we can conclude that:
• Independent variable: ,x
• Dependent Variable: ,y