Sir please give me a detailed solution of this question as it is taken from linear equations in two variables in which we have to find the value of variables x and y from the equations 0.4x+0.3y=1.7, 0.7x-0.2y=0.8
RS Aggarwal, Class 10, chapter 3B, question no 13
0.4x+0.3y=1.7...(1),
0.7x−0.2y=0.8....(2).
Multiply both the equations by 10, we get
4x+3y=17...(1)
7x−2y=8...(2)
Multiply (1) by 2 and (2) by 3,
8x+6y=34
21x−6y=24
Adding both the equations
29x=58
x=2
From (1):4×2+3y=17
⇒8+3y=17
⇒3y=17−8=9
y=3
Answer : x=2,y=3