Solving an equation

The billing schedule for dental X-rays specifies a fixed amount for the office visit plus a fixed amount for each
X-ray exposure. Equation format is y = mx + b.
a. Write the equation when 2 X-rays cost $37, m and b are not known.
b. Write the equation when 4 X-rays cost $54, m and b are not known.
c. Use the two equations to find m and b.
d. Find the cost of 5 exposures

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