Question 365489
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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
{{{graph( 300, 300,-6,6,-6,6,2x-3, -.5x + 2) }}}