Question

0.5x + 0.7y = 0.74 0.3x + 0.5y =0.5

Answer 1

0.5 x +0.7 y = 0.74 (i)
multiply 10 on both sides in (i)
=> 5x+7y=7.4

0.3 x + 0.5 y =0.5 (ii) 
multiply 10 on both sides in (ii)
3 x + 5 y = 5 
y=1-0.6x (from ii equation)

Now, Substitute value in equation i

5x+7y = 5x + 7(1-0.6x)=7.4

=>5x +7-4.2x =7.4

=>0.8x+ 7 = 7.4

=>x=0.5
Now substitute x value in any equation. 
Let us take the second equation.

0.3x + 0.5y =0.5

(0.3×0.5)+0.5y= 0.5
0.3+y= 1

∴y=0.7

Hope my answer is helpful to u. Pls mark it the brainliest if u like.

Answer 2

Answer:x=0.5 and y=0.7

Explanation:0.5x+0.7y=0.74___(i)

0.3x+0.5y=0.5____(i)

Multiplying 3 in i. and 5 in ii. and subtracting

1.5x+2.1y=2.22

1.5x+2.5y=2.5

_____________

-0.4y= -0.28

y=(-0.28)/(0.4)=0.7

So, 0.3x+0.5*0.7=0.5

x=0.15/0.3=0.5