X= sandwiches
y= bottles of water
QUANTITY EQUATION
x+y= 200
COST EQUATION
$3x + $0.75y= $318.75
STEP 1
solve for one variable in quantity equation and substitute in cost equation
x+y= 200
subtract y from both sides
x= 200-y
STEP 2
substitute 200-y in for x
$3x + $0.75y= $318.75
3(200-y) + 0.75y= 318.75
600 - 3y + 0.75y= 318.75
combine like terms
600 - 2.25y= 318.75
-2.25y= -281.25
divide both sides by -2.25
y= 125 number of water bottles
STEP 3
substitute y=125 in either equation
x+y= 200
x + 125= 200
x= 75 sandwiches
ANSWER: There were 75 sandwiches and 125 bottles of water.
Hope this helps! :)
Answer: A
Step-by-step explanation:
Answer:
The two numbers are 12 and 6
Step-by-step explanation:
12 - 6 = 6
16 / 6 = 2
Hope this helps!
Answer: n=9
Step-by-step explanation:
5n-12=3n+6
move 12 to the other side
5n=3n+18
then move 3n to the other side
2n=18
n=9
Answer:
11
Step-by-step explanation:
Evaluate the parenthesis to begin with
2*3 = 2² - 3² = 4 - 9 = - 5
Thus
6 * (- 5) = 6² - (- 5)² = 36 - 25 = 11
