Question

help me solving this 3rd question

Answer 1

Hope it helps u...
Thn q

Answer 2

0.4 x + 0.3 y =1.7
0.7 x - 0.2 y  =0.8

on removing the decimals , we get 
4/10x + 3/10y =17/10
7/10x - 2/10y =8/10

4x +3y =17/10 X 10
7x - 2y =8/10 X10

THEREFORE,
4x + 3y =17[x2]
7x - 2y =8   [x3]

⇒8x + 6y =34
   21x -6y=24

 ⇒29x =58
     x=58/29
   ⇒x=2

putting this value of x in any one of the equations,we get 

7x -2y=8
7[2]-2y=8
14-2y=8
-2y=8-14
-2y=-6
y=-6/-2
y=3

therefore,
x=2,y=3

hope it helps you!!!