Question

For what value of k does the following pair of linear equations have no solution?
10x + 5y - ( k-5) = 0
20x + 10y - k = 0​

Answer 1

Step-by-step explanation:

10x+5y-(k-5)=0

20x+10y-k=0

Multiply equation 1 with 2

20x+10y-2(k-5)=0

20x+10y-k=0

For lines to be coincident,

2(k-5)=k

2k-10=k

k=10