exam Maths Puzzle Numerical Ability

I have two questions Solve Algebraically

#5 N= -2M t 9
N= 3M -11

#6 y = 1.5x -8
y = -2.5x t 2.5

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exam Other Question

How much water should be added to 6 gallons of pure acid to obtain a 30% solution? Without using a calculator, find the value of 7^103-7^101/7^102+7^100. Show your work. (Hint: factor)