27 + y = 42 - 4y so 5y = 15 making y = 3 and x = 6
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42+4y -12 = 13y -12 -2y 4y -13y+2y = 12 -12 -42 -7y = -42 y = 6
If x - 4y = 2 and x + 4y = 2 then the only solution is when y = 0 and thus x = 2.
(8 + 4) x 5...
5x+4y = -3 4y = -5x-3 y = -5/4 x - 3 Slope is -5/4.
4y = 2y + 40 4y - 2y = 2y -2y +40 2y = 40 y = 20 check 4(20) = 2(20) +40 80 = 80