Tutors Answer Your Questions about Linear-systems (FREE)
Question 335139: Let X be the driving time (in hours) since a person has fueled up his car, and let Y be the number of gallons of gas in the car's gas tank. Assume that the equation y=-3X+18 describes the relationship between X and Y.
Question: What does the variable y represent? what is the unit of y?
Write the equation that describes the relation between the variables.
Find the X-intercept and the Y-intercept. Show the algebra.
Click here to see answer by stanbon(75887)  |
Question 335431: solve each system by graphing check your answer
(y=1/2x+2
(y=-x-1
i have tried this problem and got a point in between -1,-2 and -1,-1 but i really doubt its right because the other 3 problems i tried like this i checked with calculator and were wrong please help me!
Click here to see answer by Fombitz(32388)  |
Question 335395: At the north campus of a small liberal arts college, 10% of the students are women. At the south campus, 50% of the students are women. The campuses are merged into one east campus. If 40% of the 1200 students at the east campus are women, how many students did the north and south campuses have before the merge?
Click here to see answer by nyc_function(2741)  |
Question 335371: A certain college offers students two monthly options for local telephone service.
Option A: Unlimited number of local calls for $20.00 per month.
Option B: Basic charge of $15.00 per month plus $0.10 charge for each local call.
What is the least number of local calls in a month for which option A is less expensive than option B?
(A) 5 (B) 15 (C) 49 (D) 50 (E) 51
Click here to see answer by Fombitz(32388) |
Question 335713: Haven't taken Algebra in 20 years and I am struggling already in my first week. Could someone explain this problem to me step by step so I might get it:
Use substitution method to solve:
2x+7y=48 (1)
x= 28-4y (2)
This is what I think:
If I know that X= 28-4y do I plug that into the 1st equation? 2(28-4y) + 7y =48 ??
Click here to see answer by Fombitz(32388) |
Question 335898: Cowling’s rule. Cowling’s rule is another method for
determining the dosage of a drug to prescribe to a child.
For this rule, the formula
d=D(a+1) divided by 24
gives the child’s dosage d, where D is the adult dosage
and a is the age of the child in years. If the adult dosage
of a drug is 600 milligrams and a doctor uses this
formula to determine that a child’s dosage is
200 milligrams, then how old is the child?
Click here to see answer by stanbon(75887) |
Question 336180: After robbing a bank in Dodge City, a robber gallops off at 12 mi/h. 10 minutes later, the marshall leaves to pursue the robber at 16 mi/h. How long (in hours) does it take the marshall to catch up to the robber?
Click here to see answer by stanbon(75887) |
Question 337178: I've been trying to simplify the following expression and keep missing a step while doing so. Can you please assist me? Thank you!
1/2(3x + 2)- 1/4(3x - 2)=
[{{(1/2)*3x} + {(1/2)*(2/1)}} + {-1{{(1/4)*3x}-{(1/4)*2}}}]=
[{(3x/2)+(2/2)} + {-1{(3x/4)-(2/4)}}]=
[{(3x/2+1)} + {-1*(3x/4)}-{(-1)*(1/2)}}]=
[(3x/2+1)} + {{(-1)*(3x/4)}-{(-1)*(1/2)}]=
[{3x/2 + 1} + {-3x/4 + 1/2}]=
[{3x/2 + 1} + {-3x/4 +1/2}]=
[3x/2 +1 -3x/4 +1/2]=
3x/2 -3x/4 + 1+ (1/2)=
2/2*3x/2 - 3x/4 +1 1/2 =
(6x/4-3x/4) + 1.5 =
3x/4 +1.5
or 3/4x + 1.5
Click here to see answer by stanbon(75887) |
Question 337178: I've been trying to simplify the following expression and keep missing a step while doing so. Can you please assist me? Thank you!
1/2(3x + 2)- 1/4(3x - 2)=
[{{(1/2)*3x} + {(1/2)*(2/1)}} + {-1{{(1/4)*3x}-{(1/4)*2}}}]=
[{(3x/2)+(2/2)} + {-1{(3x/4)-(2/4)}}]=
[{(3x/2+1)} + {-1*(3x/4)}-{(-1)*(1/2)}}]=
[(3x/2+1)} + {{(-1)*(3x/4)}-{(-1)*(1/2)}]=
[{3x/2 + 1} + {-3x/4 + 1/2}]=
[{3x/2 + 1} + {-3x/4 +1/2}]=
[3x/2 +1 -3x/4 +1/2]=
3x/2 -3x/4 + 1+ (1/2)=
2/2*3x/2 - 3x/4 +1 1/2 =
(6x/4-3x/4) + 1.5 =
3x/4 +1.5
or 3/4x + 1.5
Click here to see answer by chiexpert(48) |
Question 337561: After robbing a bank in Dodge City, a robber gallops off at 13 mi/h. 30 minutes later, the marshall leaves to pursue the robber at 15 mi/h. How long (in hours) does it take the marshall to catch up to the robber?
Click here to see answer by Fombitz(32388) |
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