Question

An equation that defines y as a function of x is given. a. solve for y in terms of x and

replace y with the function notation f(x) . b. find f(3).

6x-3y=2

Answer 1

• f(x) = 2x -2/3
• f(3) = 5 1/3

Explanation:

We solve an equation for a specific variable by using inverse operations to undo what is done to the variable. The resulting function is evaluated by substituting the given value for the variable.

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a.

We are given the equation ...

6x -3y = 2

Solving for y, we get ...

6x -2 = 3y . . . . . add 3y-2 to both sides

2x -2/3 = y . . . . . divide by 3

f(x) = 2x -2/3 . . . . write using functional notation

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b.

To find f(3), we use x=3 in the function.

f(3) = 2(3) -2/3 = 6 -2/3

f(3) = 5 1/3