Advertisements
Advertisements
प्रश्न
If (2, −5) is the solution of the equation 2x − ky = 14, then find k = ?
उत्तर
(2, – 5) is the solution of 2x – ky = 14.
Substituting x = 2, y = – 5 in 2x – ky = 14, we get
2(2) – k(– 5) = 14
∴ 4 + 5k = 14
∴ 5k = 14 – 4 = 10
∴ k = `10/5` = 2
APPEARS IN
संबंधित प्रश्न
If the point A(3, 2) lies on the graph of the equation 5x + ay = 19, then find a.
If the point (3, 2) lies on the graph of the equation 5x + ay = 19, then find a.
Solve the following pair of linear equations by the substitution method.
x + y = 14
x – y = 4
Solve the following pair of linear equations by the substitution method.
s – t = 3
`s/3 + t/2 = 6`
Solve the following pair of linear equations by the substitution method.
`sqrt2x + sqrt3y = 0`
`sqrt3x - sqrt8y = 0`
Solve the following systems of equations:
11x + 15y + 23 = 0
7x – 2y – 20 = 0
Solve the following systems of equations:
0.4x + 0.3y = 1.7
0.7x − 0.2y = 0.8
Solve the following systems of equations:
`x/7 + y/3 = 5`
`x/2 - y/9 = 6`
Solve the following systems of equations:
`(x + y)/(xy) = 2`
`(x - y)/(xy) = 6`
Solve the following systems of equations:
`2/x + 5/y = 1`
`60/x + 40/y = 19, x = ! 0, y != 0`
Solve the following systems of equations:
`6/(x + y) = 7/(x - y) + 3`
`1/(2(x + y)) = 1/(3(x - y))`, where x + y ≠ 0 and x – y ≠ 0
Solve the following systems of equations:
`"xy"/(x + y) = 6/5`
`"xy"/(y- x) = 6`
Reena has pens and pencils which together are 40 in number. If she has 5 more pencils and
5 less pens, then the number of pencils would become 4 times the number of pens. Find the
original number of pens and pencils.
Solve the following system of equations by eliminating ‘y’ (by substitution) :
3x – y = 3
7x + 2y = 20
Solve the following set of simultaneous equation.
x + y = 4 ; 2x - 5y = 1
Solve the following set of simultaneous equation.
2x - 7y = 7; 3x + y = 22
If 49x – 57y = 172 and 57x – 49y = 252 then x + y = ?
In the equation 2x – y = 2 if x = 3, then find y = ?
A person starts a job with a fixed salary and yearly increment. After 4 years his salary is ₹ 15000 and after 10 years it becomes ₹ 18000. Then find his monthly salary and increment
To draw a graph of 4x + 5y = 19, find y when x = 1.
