exam Maths Puzzle Numerical Ability

kindly help me solve this one.

x/77x-121y - y/49x-77y

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exam Other Question

1) An open-top box is to be constructed from a 6 foot by 8 foot rectangular cardboard by cutting out equal squares at each corner and the folding up the flaps. Let x denote the le Write the equation of the line with given slope and y-intercept. Then graph each line using the slope and y-intercept.

Slope -2; Y intercept (0,4)