Just use the conditions for the consistancy of the given equation.

Assume the cost of bat x and that of ball y and solveÂ the question according to the given question .

Just check the ratio of the coefficients of the given pair of the linear equations ,to find if its consistent or inconsistent.and if, its consitent then find the solutions using the graphical method.

Suppose that fathers and sons present age be x and y respectively.Now form equation and find age of the Father and Son.

Take number of 25 paise coins as x and that of 50 paise coins as y .Use the given information to make equations for x and y .Â

Assume number of multiple type questions be x and number of short answer type question be y.Set up the linear equation according to given conditions.As the total number of questions is 75,So first equation comes out to be x+y=75. And next equation can be set up by using the given conditions.

Just check the ratio of the coefficients of the given pair of the linear equations ,to find if its consistent or inconsistent.and if, its consitent then find the solutions using the graphical method.

Let the length and width of the rectangle be x and y respectively .Then use the formulae for the perimeter of the rectangle.

Assume number of multiple type questions be x and number of short answer type question be y.Set up the linear equation according to given conditions.As the total number of questions is 75,So first equation comes out to be x+y=75. And next equation can be set up by using the given conditions.

Suppose that mothers and sons present age be x and y respectively.Now form equation and find age of the Mother and Son.