5 - 17
x is adding multiples of 3 to get y
example: 2+3=5, 3+6=9 4+9=13, 5+12=17 and so on.
Given:
Total number of friends = 5
Total cost of all five meals = $51.94
Sales tax = 6%
To find:
The cost of one meal before tax was added.
Solution:
Let x be the cost of all five meals before tax.
Then, Amount of tax = 6% of x
According to he question,
Divide both sides by 51.94.
So, the cost of all five meals before tax is $49.
Divide this cost by 5 to get the cost of one meal before tax was added.
Therefore, the cost of one meal before tax was added, is $9.8.
-2x+9y=41.... equation 1
-2x-5y=1 ....equation 2
________________
14y=43
y=43/14
y=43/14 in equation 1
-2x+9(43/14)=41
-2x+387/14=41
-2x=41-387/14
-2x=187/14
x=187/-28
x=187/28 , y=43/14
if you want to check your answer
-2(187/28)+9(43/14)=41
Well, when you get the answer to a multiplication problem, you divide your answer to check it, so just do that with the decimals that you multiplied.
For Example:
2 x 3 = 6
6 is your answer, so, do this problem to check it:
6 / 3 = 2
Answer:
incorrect; 2½ ÷ ¾ = 3⅓; 2½ ÷ ⅜ = 6⅔; six
Step-by-step explanation:
Assume that Trey's number line model is like the first one below.
That model is incorrect.
The distance from 0 to 1 has four tick marks, so each mark represents the fraction ¼.
Trey is jumping three of them (¾) at a time.
Trey's number line represents the expression
2½ ÷ ¾ = 3⅓
The correct number line model is the second one below.
It represents the expression
2½ ÷ ⅜ = 6⅔
Ms. Nellies has enough vinegar for six groups of students