Hi, 

lines ax - y = 3 and x + 2y = b intersect at point (2,1)

using the ordered pair (2,1)

ax - y = 3

2a - 1 = 3

a = 2

Again, using the ordered pair (2,1)for the second equation

 x + 2y = b

2 + 2 = b

4 = b

 

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