If you mean: x+y = 7 and x-y = 2 then x = 3 and y = 4
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There is actually not one set answer to 4x+7y, as what it means is 4 of one value plus 7 of another. The answer depends on what the values of x and y are, due to the equation meaning 4x+7y. For example, if x=2 and y=3, then the equation is 42+73=8+21=29. However, as I feel I have to note, these may not be the variables you'll get. I hope this helped!
It is the same. The equation "x + y" is the exact same as "x + y." There is no difference.
xy + x + y + 1 = (x + 1)(y + 1).
xz + x + yz + y = (x + y)(z + 1)
xy plus 2x plus 4y plus 8 or (xy+2x) + (4y+8) or x(y+2) + 4(y+2) or (x+4)(y+2)