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

Is Y a function of d? Is d a function of y?
y 1993 94 95 96 97 98
d $2 $4 $3 $-2 $5 $2 A plumber needs 3 times as much solid pipe as perforated pipe to lay a drain line 200 feet long. How much solid pipe is needed?