4
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(5, 1)
x+7y=16 ---------------------------1 3x- 7y=4 ---------------------------2 ------------------------------------------------------------------------------------------------------------------ 1+2 x+7y=16 3x-7y=4 4x=20 x=5 substitute x = 5 in x+7y=16 (5)+7y=16 7y=11 y=11/7
The ordered pair is (5, 4).
21-7y+3x-xy7(3-y)+x(3-y)
3x-2y+9+9y-x = 2x+7y+9