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slope-intercept form equation

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1.Find an equation of the line having the specified slope and containing the indicated point. Write your answer in slope-intercept form. Please show your work.
M=1.5; (7,-2)

2. Solve this problem.

A gas station sells 4820 gallons of regular unleaded gasoline on a day when they charge $1.35 per gallon, and they sell 3930 gallons on a day when they charge $1.40 per gallon. Using an equation for the line whose graph depicts this data, predict the number of gallons sold at a price of $1.27 per gallon. Please show your work

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The slope-intercept form is provided.

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1.
equations take the form y = mx + ...

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