Consider a linear function y = 3x + 7. To write such function in function notation, we simply replace the variable y with the phrase f(x) to get; f(x) = 3x + 7. This function f(x) = 3x + 7 is read as the value of f at x or as f of x.

How to use it:

1. Install and open the app.
2. Select the appropriate math subject.
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4. Submit your equation by tapping on the send button.
5. The answers provided by the app can then be copied shared, or re-calculated.

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To write an equation in function notation, replace the y variable with f(x). The equation written in function notation would be: f(x)=x+30000 where f(x) is the number of miles on the odometer. To figure out how many miles will be on the odometer if you drive the car 700 miles, we want to find f(700).

In addition to its problem solver, Mathway has a built-in graphing tool and a glossary–just in case the solver throws some terminology around that you haven’t heard before. You can also embed any answer to show it off to others–although I’m betting more people are likely to use the e-mail link instead.

Photomath currently solves word problems for a limited number of textbooks under our Photomath Plus subscription, but we’re working hard every day to add more to our library.

An equation involving x and y, which is also a function, can be written in the form y = “some expression involving x”; that is, y = f ( x). This last expression is read as “ y equals f of x” and means that y is a function of x.

Evaluating functions using function notation. When it comes to evaluating functions, you are most often given a rule for the output. To evaluate the function means to use this rule to find the output for a given input. You can do this algebraically by substituting in the value of the input (usually x).

Solve by Multiplication Write one equation above the other. Multiply one or both equations until one of the variables of both terms have equal coefficients. Add or subtract the equations. Solve for the remaining term. Plug the term back into the equation to find the value of the first term. Check your answer.

Function notation is a compact form used to express the dependent variable of a function in terms of the independent variable. Using function notation, y is the dependent variable and x is the independent variable. The equation of a function is y = f(x), which means y is a function of x.

Function notation is a way of writing equations that tell you what variable or variables can be inputted to it. An important use of functions is in graphing equations. If you’ve got more than one equation’s line or curve, it’s convenient to label them f(x), g(x), etc. so that you’ll know which line/curve belongs to which equation.