Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 10 Answered

Two shopkeepers sell electronic goods of same kind .their sales for he two items are represented by two equations 3x+y=9and 7x+2y=20.find the sale price of each item by the two shopkeepers.
Asked by anshika adlakha | 24 Jun, 2014, 04:50: PM
answered-by-expert Expert Answer
C o n s i d e r space t h e space s y s t e m space o f space e q u a t i o n s 3 x plus y equals 9 space.... left parenthesis 1 right parenthesis a n d 7 x plus 2 y equals 20.... left parenthesis 2 right parenthesis M u l t i p l y i n g space t h e space e q u a t i o n left parenthesis 1 right parenthesis space b y space 2 space a n d space s u b t r a c t i n g space f r o m space left parenthesis 2 right parenthesis comma space w e space h a v e space space space space 7 x plus 2 y equals 20 bottom enclose minus 6 x minus 2 y equals minus 18 end enclose space space space space space x space space space space space space space space space space equals space 2 S u b s t i t u t i n g space t h e space v a l u e space x equals 2 space i n space e q u a t i o n space left parenthesis 1 right parenthesis comma space w e space h a v e 3 cross times 2 plus y equals 9 rightwards double arrow 6 plus y equals 9 rightwards double arrow y equals 9 minus 6 rightwards double arrow y equals 3 T h u s comma space t h e space s a l e space o f space t w o space i t e m s space a r e space 2 space a n d space 3
Answered by Vimala Ramamurthy | 25 Jun, 2014, 09:07: AM

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 10 - Maths
The value of 'x' and 'y' when x+y=6 and x-y=10 a) (8,-2) b) (-2,8) c) (8,2) d) (2,8)
Asked by suvarnam458 | 23 Feb, 2024, 06:18: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
10 students of class 10 took part in a mathematics quiz . if the number of girls is 4 more than the number of boys then ,find find the numbers of boys and number of girls who took part in the quiz
Asked by jaanooru | 13 Oct, 2023, 10:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Ncert solution ex.3.3 Q.no.1.6
question image
Asked by luckyalvi84509 | 20 Feb, 2021, 04:36: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
substitution method
Asked by sk6058812 | 02 Dec, 2020, 11:25: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
A number consists of two digits whose sum is 7. If 45is added to the number, the digits are reversed.Find the number
Asked by daskousik2004 | 21 Aug, 2020, 10:35: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
A boys works x+y sums, of which only y- 2z are right; how many are wrong?
Asked by guduguntlammulu28102004 | 15 Aug, 2020, 05:09: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Students of a class are made to stand in a row. If one student is extra in each row, there would be 2 rows less. If one student is less in each row, there would be 3 rows more. Find the number of students in each class. 
Asked by arindeep.singh | 29 May, 2020, 03:13: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Q-Use the method of substitution to solve each other of the pair of simultaneous equation 1} x+4y=-4 and 3y-5x=-1
Asked by karanbora625 | 19 Apr, 2020, 02:00: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Q-Use the method of substitution to solve each other of the pair of simultaneous equation 1} 2x-9y=9 and 5x+2t=27
Asked by karanbora625 | 19 Apr, 2020, 01:59: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Maths
Please solve. 
question image
Asked by kiranbora10 | 06 Apr, 2020, 09:36: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×