Questions on Algebra: Systems of Linear Equations answered by real tutors!

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Question 173853: Ok, I am lost.I now have parallel to the lines. I need to find an equation of the line that is parallel to the line y=7x-3 and passes thru the point (8,7). I thought the answer was v-7 h-3 but am not positive.? Ty in advance. Judy
Click here to see answer by solver91311(17077)

Question 173905: Pls. show how to solve question below:
Eileen who is not yet 21 yrs old is 2 yrs older than Ida. Find Ida's age.
Click here to see answer by josmiceli(9817)

Question 173905: Pls. show how to solve question below:
Eileen who is not yet 21 yrs old is 2 yrs older than Ida. Find Ida's age.
Click here to see answer by stanbon(57967)

Question 173948: -x – 6 > -3x + 9
Click here to see answer by checkley77(12569)

Question 174003: a gas station that fills portable propane tanks such as are used for camping and for outdoor barbecues charges $2.60 per gallon.
Click here to see answer by Mathtut(3670)

Question 174005: I have a page of these with no examples(Not fr. a Textbook - a handout)...please show me one and I can figure out the rest....thanks, Jessie
Write whether each of these systems of equations has a common solution or not. Explain.
y = -x+2 y = 2x+1
Click here to see answer by stanbon(57967)

Question 174146: 2x-5y=-6
8x+3y=68
solve the system of equations and enter the solution as an ordered pair.
Click here to see answer by jim_thompson5910(28715)

Question 174146: 2x-5y=-6
8x+3y=68
solve the system of equations and enter the solution as an ordered pair.
Click here to see answer by jojo14344(1512)

Question 174146: 2x-5y=-6
8x+3y=68
solve the system of equations and enter the solution as an ordered pair.
Click here to see answer by Alan3354(31532)

Question 173899: 2x-y+z=10
4x+2y-3z=10
x-3y+2z=8
Click here to see answer by Alan3354(31532)

Question 174196: What is the equation of the line that passes through the given point and is perpendicular to the given line?
i got y= -2x-3
I wasn't really understanding the problem and that's why i just want you to check my work. Thankyou so much!
Click here to see answer by stanbon(57967)

Question 174195: Which equation represents the line that passes through (0,0) and is parallel to the line passing through (2,3) and (6,1)?
a) y= 1/2x
b) y= -1/2x
c) y= -2x
d) y= 2x
Click here to see answer by stanbon(57967)

Question 174200: What is the equation of the line that passes through the given point and is perpendicular to the given line?
(8,-1), 4y + 2x = 12

i got y= -2x-3.
I tried my best, but didn't quite understand the problem, so it would be great if you could check my answer. Thankyou so much!
Click here to see answer by jim_thompson5910(28715)

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(7008)

Question 174232: Determine which lines, if any, are parallel or perpendicular.
Line a: y = 3x + 6, Line b: 3x + y = 6, Line c: 3y = 2x + 18

Click here to see answer by nerdybill(7008)

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(57967)

Question 174201: solve the system of equations and enter the solution as an ordered pair
7x-3y+5=16
4y=3x+17
Click here to see answer by jim_thompson5910(28715)

Question 174418: the linear equation x =-1 graphs as a horizontal/ vertical / diagonal line. Describe how to determine this answer.
Click here to see answer by jim_thompson5910(28715)

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 172345: 1 times a number plus -5 that will give me an answer of -3
Click here to see answer by rapaljer(4667)

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(28715)

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(12569)

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(28715)

Question 174554: 7X + 3Y = 14 , 5X + 9Y = 10
4X + Y = 16 , 2X + 3Y = 24
12X + Y = 25 , 8X - 2Y = 14

Click here to see answer by Edwin McCravy(8999)

Question 174589: c. 4x + y =17, 2x + 3y=21
d. 18x + y=42,6x-3y=-6
Please help I am having a brain cramp
Click here to see answer by checkley77(12569)

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(31532)

Question 173224: When solving systems of linear equations,what is the difference between a "true statement that yields infinitely many solutions" and a "false statement that yields no solution"?
Click here to see answer by actuary(112)

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(8999)

Question 174867: This question confused me.
2(x+1)-(y-4)=15
3(x-1)+4(y+2)=2
Click here to see answer by jim_thompson5910(28715)

Question 174865: I got a question I hardly understand let alone solve.
What value of m gives a system
y=1^2 x-2
y=mx-1 with
a) one solution
b) an infinitely many solutions
c) no solution
Click here to see answer by HyperBrain(694)

Question 174874: This 3 part question has been puzzling me
What value of m gives a system
y=1x/2x-1
y=mx-1 with
a)one solution b)an infinitely many solution c) no solution

Click here to see answer by Mathtut(3670)

Question 174964: I don't know how to do slope.
Click here to see answer by Mathtut(3670)

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(57967)

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 175076: What are the basic steps to solving a linear equation?
How do you solve 80-9y=6y?
I don't understand it at all!
Click here to see answer by Alan3354(31532)

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(28715)

Question 175131: I need help with the following
- Find the shortest distance from the point (3,1) to the line 3x+y=-2 to the nearest tenth.
Click here to see answer by stanbon(57967)

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(31532)

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