Edward C. answered • 06/24/15

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Caltech Grad for math tutoring: Algebra through Calculus

Solve the 2nd equation for y (y = x) and the 3rd equation for z (z = x/5).

Then substitute these values for y and z in the 1st equation to get 6x + (x) + 3(x/5) = 38.

Then solve this equation for x. Once you know x, use the solved 2nd and 3rd equations to find y and z.