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Answered on 19/11/2016 Tuition/Class IX-X Tuition Tuition/Class IX-X Tuition/Mathematics Linear Equations

Vimala R.

Maths Teacher

The value of k should be equal to 2, and thus the equations, 3x - y + 8 = 0 and 6x - ky = -16 represent coincident lines

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Answers 15 Comments Answered on 02/12/2016 Tuition/Class IX-X Tuition Tuition/Class IX-X Tuition/Mathematics Linear Equations

What type of solution does the pair of equations have: x + 2y + 5 = 0, -3x - 6y + 1 = 0?

Sreedevi A.

Teacher

On observing the given equations, we can say that the ratio of coefficients of 'x' and 'y' terms is same and is equal to (-1/3) but this is not equal to the ratio of constant terms. Hence, no solution.

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Answers 2 Comments Answered on 01/12/2016 Tuition/Class IX-X Tuition Tuition/Class IX-X Tuition/Mathematics Linear Equations

The line represented by x = 7 is parallel to the x - axis. Justify whether the statement is true or not?

Sachin Prasad

Math Tutor

No. It is parallel to y-axis.

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Answers 1 Comments Answered on 07/12/2016 Tuition/Class IX-X Tuition Tuition/Class IX-X Tuition/Mathematics Linear Equations

Write a pair of linear equations which has the unique solution x = -1, y = 3. How many such pairs can you write?

Sreedevi A.

Teacher

x+y=2 and x-y+4=0. The solution of pair of linear equations is (-1,3). We can write many equations like this.

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Answers 2 Comments Answered on 07/12/2016 Tuition/Class IX-X Tuition Tuition/Class IX-X Tuition/Mathematics Linear Equations

Solve: x + y = 3.3, 0.6 / (3x - 2y) = -1, 3x - 2y = 0?

Shambhavi S.

The second equation is undefined as denominator is 0, which is not possible. Thus these set of equations are inconsistent.

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Answers 1 Comments Answered on 30/11/2016 Tuition/Class IX-X Tuition Tuition/Class IX-X Tuition/Mathematics Linear Equations

Two years ago, salim was thrice as old as his daughter and six years later, he will be four years older... read more

Two years ago, salim was thrice as old as his daughter and six years later, he will be four years older than twice her age. How old are they now? read less

Chilla Rajesh

Math Trainer

Father=14 and Child= 6.

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Answers 1 Comments Answered on 24/11/2016 Tuition/Class IX-X Tuition Tuition/Class IX-X Tuition/Mathematics Linear Equations

A person, rowing at the rate of 5 km/hr in still water, takes thrice as much time in going 40 km upstream... read more

A person, rowing at the rate of 5 km/hr in still water, takes thrice as much time in going 40 km upstream as in going 40 km downstream. Find the speed of the stream? read less

Digant Saurabh Singh

Serve-Well Engineer

2.5 km/hr.

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Answers 2 Comments Answered on 04/12/2016 Tuition/Class IX-X Tuition Tuition/Class IX-X Tuition/Mathematics Linear Equations

A motorboat can travel 30 km upstream and downstream 28 km in 7 hrs. It can travel 21 km upstream and... read more

A motorboat can travel 30 km upstream and downstream 28 km in 7 hrs. It can travel 21 km upstream and return in 5 hrs. Find speed of the boat in still water and the speed of the stream? read less

Saurabh Gaur

Maths Wizard

Let speed of boat is x km/hr: speed of stream is y km/hr downstream = x+y upstream = x-y therefore equation will be 30/x-y + 28/x+y =7 21/x-y + 21/x+y =5 let x-y= 1/p and x+y= 1/q 30p + 28q = 7 multiply 1 by 3 90p+84q=21 21p... read more

Let speed of boat is x km/hr: speed of stream is y km/hr downstream = x+y upstream = x-y therefore equation will be 30/x-y + 28/x+y =7 21/x-y + 21/x+y =5 let x-y= 1/p and x+y= 1/q 30p + 28q = 7 multiply 1 by 3 90p+84q=21 21p + 21q = 5 2 by 4 84p+84q=20 by solving we get p=1/6 q= 1/14 further x+y = 14 and x-y =6 x=10 and y=4 will be the answer. read less

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Answers 1 Comments Answered on 25/11/2016 Tuition/Class IX-X Tuition Tuition/Class IX-X Tuition/Mathematics Linear Equations

The father s age is six times his son s age. Four years hence, the age of the father will be four times... read more

The father?s age is six times his son?s age. Four years hence, the age of the father will be four times his son?s age. What are the present ages, in years, of the son and the father? read less

Shikha Yadav

Tutor

Let son's age be x . Then father's age = 6x 4(x+4)=6x+4 4x+16-6x-4=0 -2x+12=0 x=-12/-2 =6 Son's age =6, father's ages is 36.

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Answers 2 Comments Answered on 07/12/2016 Tuition/Class IX-X Tuition Tuition/Class IX-X Tuition/Mathematics Linear Equations

A two digit number is obtained by either multiplying the sum of the digits by 8 and then subtracting... read more

A two digit number is obtained by either multiplying the sum of the digits by 8 and then subtracting 5 or by multiplying the difference of the digits by 16 and then adding 3. Find the number? read less

Sreedevi A.

Teacher

The number is 83.

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