exam Maths Puzzle Numerical Ability

Form the following:

a linear equation in one variable
a linear equation in two variables

Plot the graph

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exam Other Question

if a stick that is 13 inches long casts a shadow of length 16 inches at the same time an office buildings shadow is 85 ft. long, how tall is the building? Round to one decimal place. x/y + 1 // x/y - 1 expressed in lowest terms is ??