It is a linear equation in two variables. It can be simplified but cannot be solved since two variables require two [independent] linear equations.
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It represents an equation of a straight line in two dimensional space. It is equivalent to x + y = 21.
9x-3y=63 7x-3y=45 -3y=63-9x -y=21-3x y=-21+3x 7x-3(-21+3x)=45 7x+63+9x=45 7x+9x=45-63 16x=-18 x=-1.125 y=-21+3(-1.125) y=-24.375 (-1.125,-24.375)
We have 3x+9y=36, or equivalently 12x+36y=144. We also have 12x+4y=18, so subtracting these we have 32y=126 or y=63/16. Substituting this into our original equation leaves 3x=36-9*63/16 or x = 12-3*63/16 = 3/16. So: x=3/16, y=63/16
(3x - 7)(2x + 9) = 0 x = 7/3 or -9/2
63 +99 ___ 162
3 / 9x+63 / 3(3x+2)1 / 3x+2