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!
72 is the correct answer I think
Answer:yes
Step-by-step explanation:
Maybe the answer would be 12/5
M=230
m-80=150
add 80 to each sides
