book Maths Puzzle Numerical Ability

rewrite the equation so that y is a function of x solve for y

7x+y=13

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book Other Question

if n=2, what does (5-n)^3 equal? Each week a maid service cleans x houses at $60/ house. The cost to the maid service for cleaning each house is $40.00. Write an equation that relates the monthly profit, in doll