4x + 2y = 12
3x - 2y = 9 Have to use simultaneous equations, so add together to get :
7x = 21
so x = 3 Put it into any part of the equation
4x3 + 2y = 12
12 + 2y = 12
2y = 0
y = 0, x = 3
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4y+4 = 2y+12 4y-2y = 12-4 2y = 8 y = 4
-2
Both of them are equations!The solution is (x, y) = (2, 1).
4
2x+y=-12-4x-2y=30 x=-y/2+30, you plug this into -12-4x-2y=30 and get -12+2y-120-2y=30 which gives 2y-2y=162. This is not possible, so the equation is unsolvable.