Answer:
D
Explanation:
let's rewrite this
x + y = 11 - equation 1
- x = - y - 9 - equation 2
solve the first equation for x
x + y = 11 (add -y to both sides to get x by itself)
x = -y + 11 - equation 3
now substitute -y + 11 for x in the second equation
y - 11 = - y - 9 (2 negative signs next to each other equals positive)
2y - 11 = -9 (add y to both sides)
2y = 2 (add 11 to both sides)
y = 1 (divide both sides by 2)
now substitute y = 1 into equation 3
x = -1 + 11
x = 10
therefore, x = 10 and y = 1. in coordinates, x goes before y
therefore, the coordinates are (10, 1)
therefore the answer is D
good luck my friend! hope this helped a lot! also, i found a website if you don't fully understand this, its called MathPapa, i didn't use it to work this out so my working might be different but it definitely helps me sometimes. for an equation like this, type it likes this: x+y=11; -x=-y-9
-cheesetoasty