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Use Plumber B since he charges $215, $10 less than Plumber A.

Step-by-step explanation:

Let y = total cost, and x = number of hours.

Plumber A:

y = 50x + 25

For a 4-hour call, x = 4.

y = 50(4) + 25

y = 200 + 25

y = 225

Plumber A charges $225 for a 4-hour call.

Plumber B:

y = 35x + 45

For a 4-hour call, x = 4.

y = 45(4) + 35

y = 180 + 35

y = 215

Plumber B charges $215 for a 4-hour call.

Use Plumber B since he charges $215, $10 less than Plumber A.

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step-by-step explanation:

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