Question

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

written using function notation?
ORD=-v+
O f(x) = -3x+4
OF) = -3y+ 4

Answer 1

f(x) = - 3x + 4

Explanation:

letting y = f(x) , rearrange making y the subject

Given

9x + 3y = 12 ( subtract 9x from both sides )

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

y = - 3x + 4, thus

f(x) = - 3x + 4 ← in functional notation