3x+5y+8x+2y
combine 3x and 8x to get 11x
11x+5y+2y
combine 5y and 2y
11x+7y is the answer.
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(4, -1)
2y^2+5y+2=(2y+1)(y+2)
The Abelian property or commutativity.
5y = 2y+9 5y-2y = 9 3y = 9 y = 3
x + 2y = 2.90 => x = 2.90 - 2y Substitue this value of x in the other equation: 3x + 5y = 7.60 3*(2.90 - 2y) + 5y = 7.60 8.70 - 6y + 5y = 7.60 1.10 = y and then substitute this value of y in either equation to find x: x = 2.90 - 2y = 2.90 - 2*1.10 = 2.90 - 2.20 = 0.70 Solution: (x, y) = (0.70, 1.10)