Question

Consider the function represented by 9x+3y=12 with x as the independent variable. How can this function be written using

function notation?

Answer 1

f(x) = - 3x + 4

Explanation:

Given

9x + 3y = 12 ← rearrange making y the subject

Subtract 9x from both sides

3y = - 9x + 12 ( divide all terms by 3 )

y = - 3x + 4, or in functional notation as

f(x) = - 3x + 4