In Exercises 55–64, use the vertical line test to identify graphs in which y is a function of x.

For each equation, (a) give a table with at least three ordered pairs that are solutions, and (b) graph the equation. See Examples 7 and 8. y=(1/2)x-2

In Exercises 47–50, write each English sentence as an equation in two variables. Then graph the equation.The y-value is the difference between four and twice the x-value.

Find the value of the function for the given value of x. See Example 3. ƒ(x)=[[x]], for x=x-(-π)

Let ƒ(x)=-3x+4 and g(x)=-x^2+4x+1. Find each of the following. Simplify if necessary. See Example 6. ƒ(1/3)

Let ƒ(x)=-3x+4 and g(x)=-x^2+4x+1. Find each of the following. Simplify if necessary. See Example 6. ƒ(-x)

In Exercises 55–64, use the vertical line test to identify graphs in which y is a function of x.

In Exercises 71–74, determine whether each statement is true or false. If the statement is false, make the necessary change(s) to produce a true statement.The ordered pair (2, 5) satisfies 3y - 2x = - 4.

In Exercises 77–92, use the graph to determine a.the x-intercepts, if any; b. the y-intercept, if any; and e. the missing function values, indicated by question marks, below each graph.