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Tju [1.3M]
3 years ago
10

X+y=0 and x-y=10 solve by substitution.. How do I figure out the problem!

Mathematics
2 answers:
Anastasy [175]3 years ago
6 0
x+y=0 \\ x-y=10 \\\\
x=-y\\
x-y=10\\\\
-y-y=10\\
-2y=10\\
y=-5\\\\
x-5=0\\
x=5\\\\
\boxed{(x,y)=(5,-5)}
fomenos3 years ago
6 0
  x+y=0
- x-y=10
--------------
(0)+2y=-10 [x and -x cancel each other out. y minus -y is the same as y+y]
y=-5 
now substitute -5 in for y in either problem:

x+-5=0
x=5
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