91Ó°ÊÓ

Write an equation of the line with the following properties. Write the equation in slope-intercept form. $$m=-\frac{4}{3}, \text { passing through }(6,-2)$$

Graph each equation using any method. $$y=-3 x$$

In a certain city, the monthly cost of telephone service is given by the function \(C=0.10 n+12\), where \(n\) is the number of calls, 10 ts the cost per call, and \(\$ 12\) is a fixed charge. Find the cost of making 20 calls in a month.

Graph each equation using any method. $$y+x=-2$$

Determine whether the lines with the given slopes are parallel, perpendicular, or neither parallel nor perpendicular. $$m_{1}=-5, m_{2}=\frac{1}{-0.2}$$

Write an equation of the line with the following properties. Write the equation in slope-intercept form. $$m=\frac{3}{4}, \text { passing through }(8,5)$$

Assume that \(x\) and \(y\) are related by a linear equation. SEE EXAMPLE 4. (OBJECTIVE 4) An antique clock is expected to be worth \(350\)dollar after 2 years and \(530\)dollar after 5 years. What will the clock be worth after 7 years?

Set up a variation equation and solve for the requested value. The force of gravity acting on an object varies directly with the mass of the object. The force on a mass of 5 kilograms is 49 newtons. What is the force acting on a mass of 12 kilograms?

Explain why the coordinates of the origin are (0,0).

In a certain city, the monthly cost of telephone service is given by the function \(C=0.10 n+12\), where \(n\) is the number of calls, 10 ts the cost per call, and \(\$ 12\) is a fixed charge. Find the cost of making 60 calls in a month.