MENU

RD Chapter 3 Pair of Linear Equations in Two Variables Ex 3.3 Solutions

Question - 1 : -
Solve the following systems of equations:
11x + 15y + 23 = 0
7x – 2y – 20 = 0

Answer - 1 : -

11x + 15y + 23 = 0=> 11x + 15y = -23 ……..(i)
7x – 2y – 20 = 0 => 7x – 2y = 20 ……….(ii)
Multiply (i) by 2 and (ii) 15, we get
22x + 30y = -46
105x – 30y = 300
Adding we get
127x = 254 => x = 254/127 =2
7 x 2 – 2y = 20 => 14 – 2y = 20
-2y = 20 – 14 = 6
y = -3

Question - 2 : -
3x – 7y + 10 = 0
y – 2x – 3 = 0

Answer - 2 : -


Question - 3 : -
0.4x + 0.3y = 1.7
0.7x – 0.2y = 0.8

Answer - 3 : -


Question - 4 : -

Answer - 4 : -


Question - 5 : -
7(y + 3) – 2(x + 2) = 14
4(y – 2) + 3(x – 3) = 2

Answer - 5 : -


Question - 6 : -

Answer - 6 : -

Question - 7 : -

Answer - 7 : -


Question - 8 : -
4/x + 3y = 8
6/x – 4y = -5

Answer - 8 : -


Question - 9 : -
x + y/2 = 4
x/3 + 2y = 5

Answer - 9 : -


Question - 10 : -
x + 2y = 3/2
2x + y = 3/2

Answer - 10 : -


Free - Previous Years Question Papers
Any questions? Ask us!
NodeJS Interview Questions Answers
ASP.Net Interview Questions Answers
Interview Questions Answers
×