Question

prove that 2x-y+3=0 and x-2y+1=0 are not parallel​

Answer 1

Answer:

-2/1 = -1/ -2

this means

a1/a2 is not equal to b1 / b2

so it has unique solution .Therefore 2x+y+3=0 and x--2y +1 = 0 are not parrallel