Exercise 3.7

The boat goes 30 km upstream and 44 km downstream in 10 hours. In 13 hours, it can go 40 km upstream and 55 km downstream. Determine the speed of stream and that of the boat in still water. it can go 40 km upstream and 55 km downstream. Determine the speed of stream and [...]

Solve the following pairs of equations by reducing them to a pair of linear equations: x−1/5 ​+ y−2/1​= 2; x − 1/6 ​− y−2/3​ = 1 Solve the following pairs of equations by reducing them to a pair of linear equations: x−1/5 ​+ y−2/1​= 2; x − 1/6 ​− y−2/3​ = 1 October 3, 2020 [...]

Solve the pair of equations: 2/x + 3/y = 13, 5/x – 4/y = – 2 5/x - 4/y = - 2 Solve the pair of equations: 2/x + 3/y = 13 October 3, 2020 Category: Chapter 3 - Pair of Linear Equations in Two Variables , Exercise 3.7 , Maths , NCERT Class 10 [...]

For what value of K will the following pair of linear equations have infinitely many solutions? Kx + 3y − (K − 3) = 0 12x + Ky − K = 0 For what value of K will the following pair of linear equations have infinitely many solutions? Kx + 3y − (K − 3) [...]

For which values of p does the pair of equations given below has unique solution ? 4x + py + 8 = 0, 2x + 2y + 2 = 0 2x + 2y + 2 = 0 For which values of p does the pair of equations given below has unique solution ? 4x + [...]

From a bus stand in Bangalore, if we buy 2 tickets to Malleswaram and 3 tickets to Yeshwanthpur, the total cost is rs.46; but if we buy 3 tickets to Malleswaram and 5 tickets to Yeshwanthpur the total cost is rs.74. Find the fares from the bus stand to Malleswaram, and to Yeshwanthpur.​ and to [...]

The sum of a two digit number and the number obtained by reversing the digits is 66. If the digit of the number differ by 2, find the number. How many such numbers are there? find the number. How many such numbers are there? The sum of a two digit number and the number obtained [...]

Use elimination method to find all possible solutions of the pair of linear equations: 2x + 3y = 8, 4x + 6y = 7 4x + 6y = 7 Use elimination method to find all possible solutions of the pair of linear equations: 2x + 3y = 8 October 3, 2020 Category: Chapter 3 - [...]

The ratio of income of two persons is 9:7 and the ratio of their expenditure is 4:3. If each of them manages to save Rs. 2000 per month, find their monthly incomes. find their monthly incomes. The ratio of income of two persons is 9:7 and the ratio of their expenditure is 4:3. If each [...]

Let us consider the Example 3 of Section 3.2. Will the rails cross each other? x + 2y- 4 = 0, 2x + 4y – 12 = 0 2x + 4y - 12 = 0 Let us consider the Example 3 of Section 3.2. Will the rails cross each other? x + 2y- 4 = [...]