exam Maths Puzzle Numerical Ability

Mike, Louie and Joy can mow the lawn in 4,6, and 7 hours, respectively. What fraction of the yard can they mow in one hour if they work together?

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exam Other Question

Write an equation of the line that passes through the point and has the given slope. Write the equation in slope-intercept form.

(7, -7), m = -3 My study question asks....Solve the following systems of equation by any method.

All I am asking for is the name of a method so I can look up the order or way to solve it.

3x-2y=12

and

2x+y=8

Thanks!