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Re: 4x + y + 3z = 34 4x + 3z = 21 What is the value of y? [#permalink]
16 Jul 2018, 18:55

Expert's post

Explanation

This question contains only two equations, but three variables. To isolate y, both x and z must be eliminated. Notice that the coefficients of x and z are the same in both equations. Subtract the second equation from the first to eliminate x and z.