Answer:
(45,35)
Step-by-step explanation:
1 - Stack the equations on top of each other
3x - 4y = -5
4x + 4y = 40
2 - We can eliminate by subtracting the bottom equation from the top equation
3x - 4y = -5
- 4x - 4y = 40
3 - The y's cancel out, leaving us with...
3x = -5
- 4x = 40
4 - Continue simplifying
-1x = -45
5 - We can switch the -1x with -x to make things simple
-x = -45
6 - Positize (make it positive) the statement
x = 45
7 - Halfway there! Substitute the x value into one of the equations
(3 * 45) - 4y = -5
8 - Solve
135 - 4y = -5
Minus 135 on both sides
-4y = -140
Divide by -4 on both sides
y = 35
9 - Here is your answer!!
x = 45
y = 35
(45,35)
Answer:
b and c
Step-by-step explanation:
165 ounces for 11 boxes. I want to know the weight of 1 box. How do I get 11 boxes to be 1 box. Divide it by 11.
11/11 = 1 box. Since I chose 11 I have to also use 11 for the ounces
165/11 = 15 ounces per box
divide total ounces by the amount each cup can hold
678 / 8 = 84.75
so they can fill 84 cups
