Class 10 maths solutions chapter pair of linear equations in two variables

Linear equation in two variable

The graph of every linear equation in two variables need not be a line.

The cost of a notebook is twice the cost of a pen. Write a linear equation in two variables to represent this statement.(Take the cost of a notebook to be Rs x and that of a pen to be Rs y).

The cost of a notebook is twice the cost of a pen. Write a linear equation in two variables to represent this statement. (Take the cost of a notebook to be x and that of a pen to be y).

3x-2-7,3/2x+9=1/2, y/3+(y-2)/4=5 are linear equations in one variable, because the highest power of the variable in each equation in one whereas the equations 3x^2-2x+1=0, y^2-1=8 are not linear equations, because the highest power of the variable in each equation is not one. In this chapter, we shall study linear equations in one variable only.

Draw the graph of each of the following linear equations in two variables: -x+y=6 (ii) y=2x

x=5 and y=2 is a solution of the linear equation

Draw the graph of each of the following linear equations in two variables: 3x+5y=15 (ii) x/2-y/3=2