Answer:she bought 4 rolls of each color.
Step-by-step explanation:
Let x represent the number of rolls or spools of purple thread that Mrs. Bradley bought.
Let y represent the number of rolls or spools of orange thread that Mrs. Bradley bought.
Mrs. Bradley bought 8 spools of thread. This means that
x + y = 8
Each spool of purple thread is 3 meters long and each spool of orange thread is 4 meters long. If Mrs. Bradley bought 28 meters of thread in total, it means that
3x + 4y = 28
Substituting x = 8 - y into the equation, it becomes
3(8 - y) + 4y = 28
24 - 3y + 4y = 28
- 3y + 4y = 28 - 24
y = 4
Substituting y = 4 into x = 8 - y, it becomes
x = 8 - 4 = 4
4.3 repeating
Hope this helps.
-9x + b
-9(-5) + 4
45 + 4
49
Here is the equation:
43.25 = 1.25t + 7 where t is the number of minutes he was on the trampoline.