Answer:
(2/3, 13/3) (Exactly one solution)
Step-by-step explanation:
Write these equations in a column:
x+y=5
2x-y=-3
Note that we can eliminate y immediately by adding these two equations together. We get:
3x = 2, so that x = 2/3.
Substituting 2/3 for x in the first equation, we get:
2/3 + y = 5. Clear out fractions by multiplying all three terms by 3:
2 + 3y = 15, or 3y = 13. Then y = 13/3, and the solution is
(2/3, 13/3) There is exactly one solution.
Answer:
I think the most you need would be 4or 5 to be bring it to a solid D but it really depends on what percent of the grade you have like if it's a 7% then it's going to take a little bit more than that
Answer:
average hours worked = 8 hours / day
Explanation:
To get the average, we divide the total number of hours worked by the total number of days.
i.e.
average hours worked = total number of hours / total number of days
From the givens we have:
Total number of hours = 8 + 10 + 7 + 9 + 6 = 40 hours
Total number of days = 5 days
Substitute in the above rule to get the average as follows:
average hours worked = 40 / 5 = 8 hours / day
Hope this helps :)