The answer should be (6,6), you can plug 6 in for both x and y in order to solve the function.
y=12-x
(6)= 12 - (6)
6=6
Answer:

Step-by-step explanation:
Remove the parentheses and take out the constansts.

Simplify 7 x 3 to 21.

Use the product rule: 

Simplify 2+5 to 7.

Simplfiy 3 + 8 to 11.

Answer:
honestly,I also really didn't know the ans so I took it from internet. hope you won't mind
Simplify √20 to 2√5
2 * 2√5 - 3√7 - 2√5 + 4√63
Simplify √63 to 3√7
2 * 2√5 - 3√7 - 2√5 + 4 * 3√7
Simplify 2 * 2√5 to 4√5
4√5 - 3√7 - 2√5 + 4 * 3√7
Simplify 4 * 3 √7 to 12√7
Collect like terms
(4√5 - 2√5) + (-3√7 + 12√7)
Simplify
2√5 + 9√7
Answer: B