book Maths Puzzle Numerical Ability

what is the cordinates for the graph y=3x-2 and how did you get the cordinates for the slope

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Could you help me solve this problem?

1 1/15 + 3 3/10 - 2 4/5

Thanks!
Each month a gas station sells x gallons of gas at $1.92/ gallon. The cost to th owner of the gas station is $37,000. Write an equation that relates the monthly profit, in dollar