The answer depends on the domain - the set of values that x can take..
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If you mean: y = 4x-2 and y = x+13 then x = 5 and y = 18
16 + 20 + 14 = 50 = 12 + 14 +14 + 10
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To find the mean (or average) you first add up the numbers you have. NOTHING 1.88