Can someone me and teach me how to do this

x+y= 11
-x=-y-9

o a. (10,1)
o b. (11,0)
o c. (9,2)
o d. (8, 3)

A. ( 10, 1 )

Step-by-step explanation:

Isolate x for x + y = 11.

x + y = 11

Subtract y from both sides.

x + y - 11 - y

Simplify.

x = 11 - y

Substitute x = 11 - y

[ - ( 11 - y ) = -y - 9 ]

Isolate y for - ( 11 - y ) = -y - 9.

- ( 11 - y  ) = -y - 9

Expand - ( 11 - y  )

Add 11 to both sides.

-11 + y + 11 = - y - 9 + 11

Simplify.

y = -y + 2

Add y to both sides.

y + y = -y + 2 + y

Simplify.

2y = 2

Divide both sides by 2.

Simplify.

y = 1

Substitute y = 1.

x = 11 - 1

Subtract the numbers: 11 - 1

= 10

x = 10

y = 1

( 10, 1 )

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step-by-step explanation: