The lines x + 2y = 5 and 3x + by = 3 are parallel. Find b.
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if lines are parallel then a1/a2=b1/b2 ≠c1/c2
therefore
a1=1
b1=2
and c1=5
a2=3
b2=b
and c2=3
substituting values
1/3=2/b≠5/3
from 1/3=2/b
b=6
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