Use substitution when either and x or y is given, for instance: x = 2y + 3 or y = 8x - 9.
Use elimination when a number from both equations can cancel each other out, for example:
2x + 3y = 19
-2x + 7y = 12
Hope this helps!
Answer: Yes i think so put yes
11: B
12: C
They are both supplementary angles meaning they add to 180 degrees
substitute the place of the X
