SOLUTION: If you have a ancient coin and it raises its value every year by $20. In 4 years its worth $260. Write the equation y is the value of dollars and x is the years.

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Question 996937: If you have a ancient coin and it raises its value every year by $20. In 4 years its worth $260. Write the equation y is the value of dollars and x is the years.
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
slope m=20 in units of dollars per year. One of the points (x,y) is (4,260). The point-slope form of the equation can be y-260=20%28x-4%29. This is easily stepped into the slope-intercept form that you want with appropriate simplification.