Tutors Answer Your Questions about Linear-systems (FREE)
Question 334602: Please help me solve each system by graphing.
22. 3x -5y = -9
5x -6y = -8
24. 4x + 5y = -9
4y-x = 11
Please help me solve each system by substitution method. Determine whether the equations are independent, dependent, or inconsistent.
36. y = -3x + 19
y = 2x - 1
38. y = -4x-7
y = 3x
Click here to see answer by Alan3354(30993)   |
Question 334831: Hello.
I am currently working me way through a pre-course docket for a royal navy engineering course. I have a GCSE B maths grade (in 1999) and my use of maths has been fairly limited. However, I have been doing quite well in this docket, until now.
I have nipped forward to find the answer to this exerise that follows. I cannot work out how the answer was obtained; I also have no faith in this dockets authority as a number of terrible typos have beset me already.
The equation is thus:
5x+24=3x
That is exactly how it is printed in the docket. The answer, as printed, is apparently -12.
Please, could you explain to me, how this could be? I also know that with an unkown on both sides, it is customary to eliminate x from one side, however, this has still not lead to the answer of -12.
Could this be right? Or could it be the result of any number of typing errors?
Thanks for your time.
Craig Jenkins (panicking)
Click here to see answer by janakisubramanian(2) |
Question 334831: Hello.
I am currently working me way through a pre-course docket for a royal navy engineering course. I have a GCSE B maths grade (in 1999) and my use of maths has been fairly limited. However, I have been doing quite well in this docket, until now.
I have nipped forward to find the answer to this exerise that follows. I cannot work out how the answer was obtained; I also have no faith in this dockets authority as a number of terrible typos have beset me already.
The equation is thus:
5x+24=3x
That is exactly how it is printed in the docket. The answer, as printed, is apparently -12.
Please, could you explain to me, how this could be? I also know that with an unkown on both sides, it is customary to eliminate x from one side, however, this has still not lead to the answer of -12.
Could this be right? Or could it be the result of any number of typing errors?
Thanks for your time.
Craig Jenkins (panicking)
Click here to see answer by CharlesG2(828) |
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(57387) |
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(13828)  |
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(2733)  |
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(13828) |
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(13828) |
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(57387) |
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(57387) |
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