Show that the points (2,1), (11,2) and (20,3) are the solutions of the linear equation x=9y-7.
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(2,1)
x= 9y - 7
2= 9 × 1 - 7
2= 9 - 7 = 2
2 = 2
(11,2)
x= 9y - 7
11= 9 × 2 - 7
11= 18 - 7
11= 11
(20,3)
x= 9y - 7
20= 9 × 3 - 7
20= 27 - 7
20 = 20
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