Tutors Answer Your Questions about Linear-systems (FREE)
Question 174231: Which statement is true of the given lines?
Line a: -2x+y=4 Line b: 2x+5y=2 Line c: x+2y=4
a) Lines a and b are parallel.
b) Lines a and c are parallel.
c) Lines a and b are perpendicular.
d) Lines a and c are perpendicular.
Click here to see answer by nerdybill(7384)   |
Question 174230: A hockey puck leaves the blade of a hockey stick, bounces off a wall, and travels in a new direction.
a) Write and equation that models the path of the ordered pairs of (-4,0) and (0,8).
b) Write and equation that models the path of the ordered pairs of (0,8) and (-4,16).
c) Does the path of the puck form a right angle? Explain.
Click here to see answer by stanbon(75887) |
Question 173185: The value V, in dollars, of a shopkeeper's inventory software program is given by V = -40t + 350, where t is the number of years since the shopkeeper first bought the program. Find the value of the software after 0 yr., 4 yr., and 6 yr.
Click here to see answer by nycsub_teacher(90) |
Question 174547: Solve for X and Y in the following problems. Make sure you show all your work so you can get partial credit even if your final answer is wrong.
a. X + Y=6 , 2X + Y = 8
b. 7X + 3Y = 14 , 5X + 9Y = 10
c. 4X + Y = 16 , 2X + 3Y = 24
d. 12X + Y = 25 , 8X - 2Y = 14
I get the variables and graphing, however have not found any examples of how to solve only given this amount of information.
Click here to see answer by jim_thompson5910(35256) |
Question 174561: Solve the system of equations using the addition (elimination) method.
If the answer is a unique solution, present it as an ordered pair: (x, y). If not, specify whether the answer is “no solution” or “infinitely many solutions.”
6x + 2y = 2
3x + 5y = 5
Click here to see answer by checkley77(12844) |
Question 174563: Solve the system of equations using the addition (elimination) method.
If the answer is a unique solution, present it as an ordered pair: (x, y). If not, specify whether the answer is “no solution” or “infinitely many solutions.”
4x – 3y = 1
-12x + 9y = 5
Click here to see answer by jim_thompson5910(35256) |
Question 174549: . Solve for X, Y, and Z in the following systems of three equations:
a. X + 2Y + Z = 6
X + Y = 4
3X + Y + Z = 8
b. 10X + Y + Z = 12
8X + 2Y +Z = 11
20X - 10Y - 2Z = 8
c. 22X + 5Y + 7Z = 12
10X + 3Y + 2Z = 5
9X + 2Y + 12Z = 14
Click here to see answer by Alan3354(69443)  |
Question 174819: Make a scatter plot of the data below.
x: -5,-3,-3,0,1,2,5,6
y: -4,12,10,-6,8,0,3,-9
Describe the correlation of the data. If possible, fit a line to the data and write an equation of the line.
Click here to see answer by Edwin McCravy(20056)  |
Question 174976: Could someone help me out?
How much of a 40% antifreeze solution must a mechanical mix with an 80% antifreeze solution if 20 L of a 50% antifreeze solution are need?
I tried the following and was marked wrong.
Let c represent the 40% solution
___ y _____________ 80% ________
x + y= 20
40x+80y= 50
------------
40x+40y=8
40x+40y=.5
-4y=7.5
y=18.75
------------
x+18.75=20
------------
x=1.25 y= 18.75
Click here to see answer by stanbon(75887) |
Question 174973: I need help!!
- A car travelled 470 km from Sudbury to Brandford in 5 hours. For part of the trip, the car travelled at 100 km/h. For the rest of the trip, it travelled at 90 km/h. How far did the car travel at each speed?
I tried
x+y=5
100x+90=470
100x+100y=500
100x+90y=470
= 10y = 30
x=2 y=3
but I only got half marks. Where did I go wrong and what was the answer?
Click here to see answer by Electrified_Levi(103) |
Question 174973: I need help!!
- A car travelled 470 km from Sudbury to Brandford in 5 hours. For part of the trip, the car travelled at 100 km/h. For the rest of the trip, it travelled at 90 km/h. How far did the car travel at each speed?
I tried
x+y=5
100x+90=470
100x+100y=500
100x+90y=470
= 10y = 30
x=2 y=3
but I only got half marks. Where did I go wrong and what was the answer?
Click here to see answer by stanbon(75887) |
Question 175132: 5x-2y=37
3x+4y=9
It is all one problem setup like above.We have tried to add them together and tried to figure out x and y separately. This is my student's problem and I thought I would see how it is done step by step and then we can work on the rest of his assigned problems.
Click here to see answer by jim_thompson5910(35256) |
Question 175104: Solving Systems of Equations Graphically. Please solve this problem for me. I keep getting the wrong graph, therefore I must not understand how to graph these equations: y - x = 1 & y + x = 3. Thank you, Charlie
Click here to see answer by actuary(112) |
Question 175203: Can you please help me by WALKING me through how we determine that the intesect points for these two equations is (3,-1): (x - y = 4) & (x + y = 2). I need to see each step in the process of coming up with (3, -1). I know that these two points solves both equations. Thanks, Charlie
Click here to see answer by Alan3354(69443) |
Question 175203: Can you please help me by WALKING me through how we determine that the intesect points for these two equations is (3,-1): (x - y = 4) & (x + y = 2). I need to see each step in the process of coming up with (3, -1). I know that these two points solves both equations. Thanks, Charlie
Click here to see answer by actuary(112) |
Question 175338: I am having trouble understanding, "solving systems of equations by graphing."
Ex:
x+y=6
x-y=4
Then, I started to try and solve and find the ordered pair that worked for both equations. I only got this far, then I get confused:
x+y=6
-x -x
______
y=-1x+6
x-y=4
-x -x
_______
-y=-1+4
Click here to see answer by KnightOwlTutor(293)  |
Question 175610: question. 3x=4y-5
would like a detail answer so I can apply the formula to the rest of questions.
I am very quick at math but have not been using such math and have forgottem formulas so I can help my son.
Thanks Fred
Click here to see answer by Mathtut(3670) |
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