Question

For what value of C , the linear eqution 3x+cy=10 has equal value of x and y as the solution .

Answer 1

ATQ :
x=y

lets put x=y in the eqn.

3(y)+cy=10
cy=10-3y
c=(10/y)-3

so at c=(10/y)-3 or at c=(10/x)-3
x and y has equal value.