That will depend on the plus or minus value of 2y which has not been given or maybe there is an equality sign that is missing.
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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
x+2y = 7 2y = -x+7 y = -0.5x+3.5
11x + 2y
If: 3x+2y = 5x+2y = 7 which is the same as 7 = 7 = 7 Then: 3x+2y = 7 and 5x+2y = 7 Subtracting equations: x = 0 Therefore by substitution: x = 0 and y = 3.5
2y+8y2 can be factored to 2y(1+4y)