eqn 1 Y = 2X + 6
eqn 2 2X - Y = 2
Rearrange eqn2 to isolate Y
eqn2 Y = 2X - 2
so 2X + 6 = 2X - 2
subtracting 2X from both sides we get
6 = -2
As this is impossible this set of equations can not be solved.
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4x^2+2xy-3y^2-2x^2+5xy-2y2Collect the like terms=2x^2+7xy-5y^2We cannot factorise it because the end term is a negative whilst the second-last term is positive.
2(x - 1)(2x + y)
2xy=2*30*2=120
2xy + 4x + 8y + 16 = 2[xy + 2x + 4y + 8] = 2[x(y + 2) + 4(y + 2)] = 2(y + 2)(x + 4)
2 plus 1-x divided by.