Pair of Linear ...

$$ax+by=c$$ and $$mx+ny=d$$ where $$an\neq bm$$ then these simultaneous equation have -

Giri is 20 year older than his son. If the sum of their ages is 70. how old is his son?

The system of linear equations $$5x+my=10$$ and $$4x+ny=8$$ have infinitely many solutions, where m and n are positive integers. Then the minimum possible value of $$(m+n)$$ is equal to

One equation of a pair of dependent linear equation is $$ -5x +7y = 2 $$ the second equation can be

The pair of equations $$ y = 0 $$ and $$ y = -7 $$ has 

The system of linear equations $$ x +2y+5=0 $$ and $$ -3x-6y+1=0 $$ have

If $$ x=a, y=b $$ is the solution of the equations $$ x- y=2$$ and $$ x+y=4 $$ then the value of $$ a $$ and $$ b $$ are respectively

Choose the correct alternative answers for the following questions.

The solutions of the pair of equations $$ x-  y  = 0 , x  +  y = 0 $$