This form is called the slope-intercept form. f(2) means that we should find the value of our function when x equals 2.Ī function is linear if it can be defined byī is the value of the function when x equals zero or the y-coordinate of the point where the line crosses the y-axis in the coordinate plane. It is common to name a function either f(x) or g(x) instead of y. A function assigns exactly one output to each input of a specified type. In our example above, x is the independent variable and y is the dependent variable.Ī function is an equation that has only one answer for y for every x. The variable which we assign the value we call the independent variable, and the other variable is the dependent variable, since it value depends on the independent variable. In our equation y=x+7, we have two variables, x and y. We could instead have assigned a value for y and solved the equation to find the matching value of x. If we would have assigned a different value for x, the equation would have given us another value for y. If we in the following equation y=x+7 assigns a value to x, the equation will give us a value for y.
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