3.2.2 Slope-Intercept Form - Practice (continued)

5. Write the equation 5 x + 10 y = − 40 in slope-intercept form. Then graph the line described by the equation.

6. The cost of calling Raymond’s friend in Singapore is $3.00 plus $0.40 per minute. The cost as a function of time is shown in the graph. Write an equation that represents the cost as a function of the number of minutes. Identify the slope and y -intercept and describe their meanings. Find the cost of a 20-minute call.

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