Question

If ax + 2y + 5 = 0 and 2x + by + 10 = 0 represents same straight line then a + b =​

Answer 1

Answer:

The coincident lines are given as,

3x+4y+2=0

And

9x+12y+k=0

Comparing the equations with the general equations

a1x+b1y+c1=0

a2x+b2y+c2=0

Then,

a1=3,b1=4,c1=2,a2=9,b2=12,c2=k

Since, the lines are coincident, then,

a2a1=b2b1=c2c1

93=124=k2