Question

for what value of K the graph of pair of linear equations 2x+5y=k and kx+15y=18 are coincident line

Answer 1

COINCIDE MEANS INFINITELY MANY SOLUTIONS
SO,, IT HAS MANY SOLUTIONS
2/K=5/15=K/18
18×2 =K×K
36=K×K
K=6
PLZ MARK AS BRAINLIEST

Answer 2

Answer:

The value of k is 6.

Step-by-step explanation:

The given equations are

$2x+5y=k$

$kx+15y=18$

If two lines coincident lines, then

$\frac{a_1}{a_2}=\frac{b_1}{b_2}=\frac{c_1}{c_2}$

$\frac{2}{k}=\frac{5}{15}=\frac{k}{18}$

$\frac{2}{k}=\frac{1}{3}=\frac{k}{18}$

$\frac{2}{k}=\frac{1}{3}$

$6=k$

$\frac{1}{3}=\frac{k}{18}$

$18=3k$

$k=6$

Therefore the  value of k is 6.