Question

for what value of k the pair of equation 3x+4y+2=0 and 9x+12y+k=0 represent coincident lines​

Answer 1

Answer:

6

Step-by-step explanation:

x1=3. x2=9

y1=4. y2=12

z1=2. z2=k

as two equations are coincident

the condition is x1/x2=y1/y2=z1/z2

so by satisfying condition

3/9=4/12=2/k

1/3=1/3=2/k

now,1/3=2/k

by cross multiplication

k×1=2×3

k=6