Subtract first from second gives -4x = 16 so x = -4 and y = -7
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If: 5x+2y = 9 Then: y = -2.5x+4.5 in slope intercept form
There are 2 unknowns
(3x+2y)*(5x-3y) =3x*5x + 3x*(-3y) + 2y*5x + 2y*(-3y) [This is sometimes called the FOIL method - You multiply the First members of each bracket, then the Outers, Inners, Lasts] = 15x2 - 9xy + 10xy - 6y2 = 15x2 + xy - 6y2
A straight line through the points (0, 1) and (-0.4, 0).
5x - 3y -7x + 2y +3x = (5-7+3)x + (-3+2)y = x - y