If we dont have the second variable, can't we take it as a zero?

How many values of x can we put in an equation to get a value of y.

1) Can we put the values of k and m in the equation

2) Can we use the inverse operation of addition.

Can we use cross - multiplication in this question?

Let ordinate of the point be a, what would be the abscissa. Now we can use the subsitution to find the value of a.

Can we put the values in the given equation ?

If a point lies on the graph of any equation, then that point is one of the solution of that equation.

How much more the person has to pay for the first cloth.

Can we recall that variable is something that takes different values in different situations.