Question

for what value of P the following pair of linear equation represent parallel lines. 3x+2y=7;px-7y=12

Answer 1

a1/a2=3/p,b1/b2=2/-7, c1/c2=7/12
a1/a2=b1/b2
3/p=2/-7
3×-7=2×p
-21/2=p