MN would be the answer to your question because they are parallel
If X is the number of hats . . . reading backwards . . .
Thursday = Wednesday + Tuesday
17 = 1/2 X + 5
Solving:
17 - 5 = 1/2 X
12 = 1/2 X
24 = X
So she had 24 on Monday.
Here is your answer:
Move all terms with m to the left, all other terms to the right:
m + 2n + -2n = -2n + p
Combine like terms:
2n + -2n = 0
m + 0 = -2n + p
Which would equal "m = -2n + p" after you simplify.
Hope this helps!
~Nonportrit