Question

plz help...thank you...​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

the solution is,(x, y) =(3, 1)

Step-by-step explanation:

12\x+y - 4\x-y =1.......(1)

28\x+y - 4\x-y =5.......(2)

by sustitution method,

let 1\x+y = a................(3)

and 1\x-y = b...............(4)

so, from (3),(4)

12a-5b=1.........(5)

28a-4b=5.......(6)

sub. eq(5) and (6)

28a -4b = 5

-

12a - 4b = 1

____________

16a =4

a= 1\4

put a=1\4 in eq. (5)

12 x 1\4 - 4b = 1

3-4b=1

-4b=1-3

b=2\4

b=1\2

Reporting a= 1\x+y and b= 1\x-y

1\4 = 1\x+y ; 1\2 = 1\x-y

By invertendo,

4=x+y ........ (7)

2=x-y ......... (8)

Add. eq. (7), (8)

x+y = 4

+

x-y = 2

________

2x=6

x=6\2

x=3........ (9)

Put x=3 in eq. (8)

2=3-y

2-3=-y

-1 = -y

1=y .............. (10)

From (9), (10)

(x,y) = (3, 1)

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