Question

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

function notation?
O f(x) = - 2 / 3 x + 2/3
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Answer 1

f(x) = -3x + 4

Second option

Explanation:

In function notation, the "y" variable is isolated and replaced with "f(x)".

Isolate "y" by keeping "y" on the left and moving everything else to the right. To move something, do its reverse operation to both sides.

9x + 3y = 12

9x + 3y - 9x = 12 - 9x Do -9x on both sides

3y = -9x + 12

3y/3 = -9x/3 + 12/3 Divide by 3 on both sides

y = -3x + 4 Change to function notation

f(x) = -3x + 4 Answer