Question

0.2x+0.3y=1.3
0.4x+0.5y=2.3

Answer 1

Hello Friend,
0.2x+0.3y=1.3
(0.2x+0.3y)×10=1.3×10
2x+3y=13 ---[1]
0.4x+0.5y=2.3
(0.4x+0.5y)5=2.3×5
2x+2.5y=11.5 ---[2]
Eq. [1]-[2]
2x+3y-2x-2.5y=13-11.5
0.5y=1.5
5y=15
y=3
x=(13-3y)/2=(13-3×3)/2=2
hope it helps.

Answer 2

0.1x+0.15y=0.65  ___(3)

0.12x+0.15=0.69 _____(4)

on subtraction (ghatane par)

0.02x+=0.04

x=0.04/0.02=2

on putting the value of x in equation (3)

(samikaran 3 me x ka maan rakhne par)

0.1x+0.15y=0.65

0.1*2+0.15y=0.65

0.2+0.15y=0.65

on cross multiplication (pakshantar kar ne par)

0.15y=0.65-0.2

y=0.45/0.15=3

hence, x=2 and y=3 ans

(atah, x=2 aur y=3 uttar)