Advertisements
Advertisements
प्रश्न
In the equation 2x – y = 2 if x = 3, then find y = ?
उत्तर
Substituting x = 3 in 2x – y = 2,
we get 2(3) – y = 2
∴ 6 – y = 2
∴ y = 6 – 2
∴ y = 4
APPEARS IN
संबंधित प्रश्न
The difference of two natural numbers is 5 and the difference of their reciprocals is 5/14. Find the numbers.
Solve the following pair of linear equations by the substitution method.
s – t = 3
`s/3 + t/2 = 6`
Form the pair of linear equations for the following problem and find their solution by substitution method.
The coach of a cricket team buys 7 bats and 6 balls for ₹ 3800. Later, she buys 3 bats and 5 balls for ₹ 1750. Find the cost of each bat and each ball.
Form the pair of linear equations for the following problems and find their solution by substitution method.
The taxi charges in a city consist of a fixed charge together with the charge for the distance covered. For a distance of 10 km, the charge paid is ₹ 105 and for a journey of 15 km, the charge paid is ₹ 155. What are the fixed charges and the charge per km? How much does a person have to pay for travelling a distance of 25 km?
Solve the following simultaneous equations
`1/(3x)-1/(4y)+1=0`;
`1/(5x)+1/(2y)=4/15`
Solve the following systems of equations:
`x+y = 2xy`
`(x - y)/(xy) = 6` x != 0, y != 0
Solve the following systems of equations:
`44/(x + y) + 30/(x - y) = 10`
`55/(x + y) + 40/(x - y) = 13`
Solve the following systems of equations:
`2(1/x) + 3(1/y) = 13`
`5(1/x) - 4(1/y) = -2`
5 books and 7 pens together cost Rs 79 whereas 7 books and 5 pens together cost Rs 77. Find the total cost of 1 book and 2 pens.
A and B each have a certain number of mangoes. A says to B, “if you give 30 of your mangoes, I will have twice as many as left with you.” B replies, “if you give me 10, I will have thrice as many as left with you.” How many mangoes does each have?
One says, “Give me a hundred, friend! I shall then become twice as rich as you.” The other replies, “If you give me ten, I shall be six times as rich as you.” Tell me what is the amount of their respective capital
Solve the following simultaneous equations by Cramer's method.
`x+y=7,2x-3y=9`
Solve the following set of simultaneous equation.
2x + y = 5; 3x - y = 5
The solution of the equation x − y = 10 and x + y = 70 is ______
If (2, −5) is the solution of the equation 2x − ky = 14, then find k = ?
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. The present ages, in years, of the son and the father are, respectively ______.
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?
To draw a graph of 4x + 5y = 19, find y when x = 1.
The coach of a cricket team buys 4 bats and 1 ball for ₹ 2050. Later, she buys 3 bats and 2 balls for ₹ 1600. Find the cost of each bat and each ball.
