You know that 43 pounds are used each day, and they say 365 days, so what do you do?
You multiply
Use elimination
Multiply first equation by 4
12a - 8b = 56
12a + 9b = 39
Subtract both
-17b = 17
b = -1
Plug in -1 for b
3a - 2(-1) = 14
3a = 12, a = 4
Final answer: a = 4, b = -1
Answer:
This, simplified would be 2x-10
Step-by-step explanation:
45X + 2000 = Y
Where X = Number of units
Y = Total Cost