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To find the mean (or average) you first add up the numbers you have. NOTHING 1.88
Plus mean Example:2+2=4 It mean to add with your finger or on a piece of paper
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If you mean x+2y = -2 and 3x+4y = 6 then by solving the simultaneous equations by substitution x = 10 and y = -6
If you mean 2 plus something equals 5 then 2+3 = 5