book Maths Puzzle Numerical Ability

determine the linear function whose graph is a line that perpendicular to the line g(x)= -3x-4 and contains the points (3,7)

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book Other Question

how shall i find the square root of 169 without using calculator?? please describe briefly.. i have another question, and this is how to find the points so that i can graph y=2x-1 this is totally different from the one i just sent to you, and i dont get how to solve th