exam Maths Puzzle Numerical Ability

How do I write the function of a line with the equation : y=6x+7 ??

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solve for x

-.3(x-5)+4(x-6)=.1x-9 bhagwanti inherited Rs.12000/-. she invested part of it as 10% and the rest at 12%. Her annual income from these investment is Rs.1280/- how much did she invest at each rate.