Question

please help me doing this!!​

Answer 1

Explanation:

10x-10y+2x+2y=4

4(3x-2y)=4

3x-2y=1

15x-15y+5y+5x=-2

10(2x-y)=-2

2x-y=-1/5

Answer 2

Explanation:

Let 1/x+y =u& 1/x−y =v

then

(10u + 2v = 4)3

(15u − 5v = −2)2

10u + 2=4

u = 1/5

−(30u − 10v = −4)

__________________

16v = 16

__________________

v=1 ; u= 1/5 = 0.2

1/x + y = 1/5 ;x + y = 5

1/x − y = 1 ; x − y = 1

x + y = 5

x − y = 1

_________

2x=6

_________

x=3&y=2

hope it helps !!