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Anonymous
Since there are two variables, there are an infinite number of solutions (combinations of x and y). The graph will be a straight line. You may want to solve for "y" or for "x" to get a better idea.
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8
x=4 y=4
x = 2y = 4
X = 4
The quadratic expression x2+6x+8 when factorised equals (x+2)(x+4)