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

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Question 102783: I'm confused, please help.
Solve the system by addition method:
Eq 1 states: .18x + .27y = .09
Eq 2 states: .06x - .54y = -.04
Thank you
Click here to see answer by jim_thompson5910(35256)

Question 102867: On a 50 question true-false test, a student received 3 points for each correct answer. For each incorrect aswer, the student lost 1 point. For uanswered question, no poits were added or deducted.
a. What is the best possible score
b. Find the worst possible score
c. Find the linear function that converts the raw score described above to a score from 0-100.
d. What score fom 0-100 corresponds to a test result of 38 correct, 4 incorrect, and 8 omitted.
Click here to see answer by stanbon(75887)

Question 102812: Hello, I was hoping that you could help me with the following question.
Solve
1/5[4(k+2)-(3-k)]=4
Thank You

Click here to see answer by scott8148(6628)

Question 102850: 1. explain why (5,-2) and (-2,5) do not represent the same ordered pair.

Click here to see answer by rapaljer(4671)

Question 102907: Please help

Click here to see answer by jayanthihemkos@yahoo.com(87)

Question 102960: Can someone help me understand this problem???
"There are 385 surfers in sufr City. two thirds of the boys are surfers and one-twelfth of the girls are surfers. if there are two girls for every boy, then how many boys and how many girls are there in surf city??
Click here to see answer by MathLover1(20850)

Question 103018: Hello, I need some assistance with this problem. Could you please help me with it?
3(a-5)+19=-2
Click here to see answer by stanbon(75887)

Question 103014: How do you find slope visually?
Click here to see answer by stanbon(75887)

Question 103072: I am having so much trouble understanding this problem. Please help!
Find the slope of the line through the given points. Also find the slope intercept form. Find the Y intercept and the X intercept for one of the points.
(-7/5, 3/10) and (1/5, -1/2)
Click here to see answer by stanbon(75887)

Question 102734: a steamer going downstream in a river covers the distance between two towns in 20 hour coming back upstream it covers this distance in 25 hours the speed of water is 4 km/h. find the distance between the two town.
(hint : first find the speed of steamer in still water.)
Click here to see answer by ankor@dixie-net.com(22740)

Question 103058: well my mean math teacher got mad at me so im stuck simplifing the equation 3x+2n=(4y-2+3x)
Click here to see answer by ankor@dixie-net.com(22740)

Question 103100: 5x-8=2x+7
Click here to see answer by doukungfoo(195)

Question 103136: kanchan receives a cdertian amount of money on her retirement from her employer. she give half of this money & an additional sum of Rs.10000/- to her daughter. she also gives one third of the money received & an additional sum of Rs.3000/- to her son. if the daughter gets twice as much as the son. find the amount of money kanchan received on her retirement.
Click here to see answer by HyperBrain(694)

Question 103144: determine the point of intersection algebraically
f(x)=-2x^ + 6x - 5, g(x)=-4x + 19
How do you solve this?
Click here to see answer by Fombitz(32388)

Question 103145: determine the point of intersection of each pair of functions
f(x)= -2x^-5x+20, g(x)=6x-1
Click here to see answer by srinivas(5)

Question 103178: Find two consecutive even integers such that the lesser added to three times the greater gives a sum of 46.
Click here to see answer by doukungfoo(195)

Question 103137: a motorboat covers a certain downstream in a river in 5 hours it covers the same distance upstream in five hour and a half the speed of the water is 1.5 km. find the speed of the boat in still water.
Click here to see answer by edjones(8007)

Question 102733: a motorboat covers a certain downstream in a river in 5 hours. it cover the same distance upstream in 5 hours and a half. the speed of water is 1.5 km. find the speed of the boat in still water.
Click here to see answer by edjones(8007)

Question 103128: in 1997, france was most visited country in the world and the US was the 2nd most most visited. a total of 116 million people visited one of the 2 countries . if 18 million more people visited france than the US, how many people visited each country...?

this was just actually given by our teacher..
Click here to see answer by edjones(8007)

Question 103214: Please help
2x=7y
Click here to see answer by elima(1433)

Question 103000: If you bought 850 Douglas firs and ponderosa pines and paid an average of $300 for douglas firs and $225 for ponderosa pines and the total you spent was $217,500 how many of each tree did you buy?
Click here to see answer by HyperBrain(694)

Question 103444: okay. today my teacher went over this, but I still do not understand it. She said to do something like a scale in science "whatever you do to this side, do to the other." but i still dont get it. HELP!!!
Click here to see answer by doukungfoo(195)

Question 103449: Theproblem is to solve these 2 equations by graphing.
Eq.1:x-y=4 I came up with the ordered pairs (4,0)(5,1) (6,2)
Eq.2: -x-y=6 The negative signs confuse me. How do I find the ordered pairs?
I don't have a problem with the actually plotting of the points, I just need help figuring out the pairs.
Please help!
Thanks,
Vicki
Click here to see answer by scott8148(6628)

Question 103615: The length of a rectangle is 3 inches more than the width. The perimeter of the rectange is 24 inches.
a.define variables
b.write the expression for the length in terms of the width
c.substitute what you know into the equation. Be sure you only have one variable
d.what is the length of the rectangle?
Click here to see answer by Fombitz(32388)

Question 103564: Solve the system by substitution. Help me please.
x + y = 12
y = 2x
Click here to see answer by ptaylor(2198)

Question 103695: 2x - y = 4
2x - y = 6
there is also a graph with this. help

Click here to see answer by jim_thompson5910(35256)

Question 103732: i know how to do linear combination, but i cannot get the right answer for this problem:
2x+y+52=2y+50
2x+y+52=x-3y+131
I need help finding x and y.
Thank you!
Click here to see answer by stanbon(75887)

Question 103775: Using substitution to find the point (x,y)
y=3-2x
y=5+2x
Click here to see answer by jim_thompson5910(35256)

Question 103946: Rectangle of a perimeter is 240cm. If the lenght of rectangle is decreased by 10% & breadth is increased by 20% the perimeter remain same(i.e. 240cm) find the length & breadth of rectangle
Click here to see answer by ankor@dixie-net.com(22740)

Question 103770: I need a real-life application of a linear function. State the application, give the equation of the linear function, and state what the x and y in the application represent. I have to choose at least two values of x to input into my function and find the corresponding y for each. State, in words, what each x and y means in terms of your real-life application.
Click here to see answer by elima(1433)

Question 104064: how do i draw a line of best fit on a scatter plot?
Click here to see answer by stanbon(75887)

Question 104376: I need help solving this word problem....
Click here to see answer by stanbon(75887)

Question 104437: 2. For the following system:
{2x+3y=8}
{-3x+4y=-1}
a. x value smaller than y
b. y value smaller than x
c. no solution
d. infinite solutions
Click here to see answer by jim_thompson5910(35256)

Question 104506: How do I solve the following system by substitution
5x-2y=-5
y-5x=3

The solution for this system is =>

Click here to see answer by Earlsdon(6294)

Question 104530: Solve the following system.
3x - 6y = 9
x -2y = 3
Is this going to turn into a fraction? If so, how do I do it? Not sure. Thank you for your helpin getting me going in the right direction..
Click here to see answer by Fombitz(32388)

Question 104573: Multiply both sides of each equation by a common denominator to eliminate the fractions. then solve the system
x/2 + y/3 = 8
2x/3 + 3y/2 = 17
Click here to see answer by jim_thompson5910(35256)

Question 104602: I am having a problem finding a line that goes through (4,6)(5,8)
I am using y2-y2 over x2-x1
8-6= 2
5-4= 1
Then y=mx+b
y-5= 5(x+b) I get lost from here unless I am missing something. Any help would be appreciate. Thanks in advnace.
Click here to see answer by scott8148(6628)

Question 104489: Find the values for m and b in the following system so that the solution to the system is (-3,4)
5x+7y=b
mx+y=22

The value for m =>

The value for b =>

Click here to see answer by ankor@dixie-net.com(22740)

Question 104789: Your teacher is giving you a test worth 100 points containing 40 questions. There are two-point and four-point questions on the test. how many of each are on the test?
K what we have to do is write two linear equations and solve them, I have no idea how to do it so i need help please!
Click here to see answer by doukungfoo(195)

Question 104816: Suppose you are starting an office-cleaning service. You have spent $315 on equiptment. To clean an office, you use $4 worth of supplies. You charge $25 per office. How many offices must you clean to break even?
K what you do is write a linear equation for the problem and then you solve..but i have no idea. please help!!
Click here to see answer by cheesey(22)

Question 104831: Suppose you bought supplies for a party. Three rolls of streamers and 15 party hats cost $30. Later, you bought 2 rolls of streamers and 4 party hats for $11. How much did each roll of streamers cost? How much did each party hat cost?
K you have to write a linear equation and then solve it. Please help.
Click here to see answer by scott8148(6628)

Question 104886: Write a system of two equations in two unknowns for each problem. Solve each system by substitution.
Tickets for a concert were sold to adults for $3 and to students for $2. If the total receipts were $824 and twice as many adult tickets as student tickets were sold, then how many of each were sold?
I'm struggling with how to set this problem up and solve it. Is it somthing like: 3a>2=824?
Click here to see answer by oberobic(2304)

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