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

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Question 226098: Directions: Translate each sentence into an equation. Then find four solutions for each equation. Write the solutions as ordered pairs. Graph each equation.
1.) Some number is four more than a second number.
Am I supposed to use y=mxtb or use a normal setup of equations? And when I did try y= 4(2)+b I only got 8. And I didn't know what to do with the two variables. So would I do the slope first? I didn't try that because they don't list four different numbers in the question; but I can't complete y=mxtb without knowing what b is. Thanks for your help!
Click here to see answer by solver91311(16897)

Question 226304: What is the equation for a line that contains the points (0,4) and is parallel to y=2x+3?
Click here to see answer by drj(1380)

Question 226538: Hello, I am trying to help my daughter with her algebra homework, but Im a little rusty myself. I've been able to help her understand a few of the problems but these have stumped the both of us. Help would be greatly appreciated! Thank you!
- Burg family

linear equation by any convenient method
2x + y - 3z = 5
x + y - 3z = 1
x - z = 4

linear equation by method of elimination
9x - 2y = 7
-18x + 4y = -7

linear equation by method of elimination
-3x - y = -3
x + 2y = -4

linear equation by any convenient method
x - 2y = -13
-2x - 2y = -4
Click here to see answer by Alan3354(30993)

Question 226616: i am having a problem with linear equation i need help bad
Click here to see answer by Alan3354(30993)

Question 226632: how do i do 5+2(3+4x)
Click here to see answer by checkley77(12569)

Question 226652: 2/3(x-6)+x=3x-2 wat does x equal please shpw work i dont get it

Click here to see answer by rfer(12678)

Question 226654: three times the largest of three consecutive even integers is twenty-two more than the sum of the other two. Find the integers

Click here to see answer by checkley77(12569)

Question 226708: use the intercepts to graph the equation
x+3y=6
Click here to see answer by drj(1380)

Question 226730: 7(2*2)-2+10
Click here to see answer by rfer(12678)

Question 226871: Can you please help me solve this equation for the variable specified? thank you
9a-2b=c+4a, for a
Click here to see answer by rfer(12678)

Question 227174: f a line passes through the points (-5, -4) and (3, -1), the equation of the line is y + 4 = 3/8(x + _____).
Click here to see answer by user_dude2008(1861)

Question 227278: 4. solve by the substitution method
3x+y=2
x=19-5y

Click here to see answer by drj(1380)

Question 227306: 1. Solve by the elimination method

5r-7s=-3
7r+5s=55

Click here to see answer by drj(1380)

Question 227331: 7H <= 6H-1
Click here to see answer by rapaljer(4667)

Question 227488: Hi can you help me solve this equation by substitution
3b+2a=2
-2b+a=8
Click here to see answer by chibisan(131)

Question 227557: use elimination to solve the system of
7x+23y=12
3x+23y=-8
Click here to see answer by checkley77(12569)

Question 227682: Solve the following system for x and y.
3x - y = 7
x + 2y = -7
Click here to see answer by jim_thompson5910(28598)

Question 227550: Why is it true that at x-intercept, the value of y is 0, and at y-intercept, the value of x is 0?
Click here to see answer by drj(1380)

Question 227942: Can you pls help me solve the system?
2x+5y=1
-x+6y=8
Click here to see answer by jim_thompson5910(28598)

Question 228088: The difference between two numbers is 9. The sum of twice the larger number and three times the smaller number is 33. Find the two numbers.

i came up with this...
x-y=9
2x+3y=33
Click here to see answer by jim_thompson5910(28598)

Question 228116: how in the world do I find three points for the equation 3y-6=0 or 2x+5=0. I already know how to do y= 3x-2 or y=-2x+3 because the y is on the side of the problem I can do anything as long as the y is on the side the 3y-6=0 the y is not next to the equal how in the world do I solve this.
Click here to see answer by ankor@dixie-net.com(15667)

Question 228146: 2. Suppose you have a lemonade stand, and when you charge $2 per cup of lemonade you sell 120 cups. But when you raise your price to $3 you only sell 60 cups.
a. Write an equation for the number of cups you sell as a function of the price you charge.
b. Denote "C" for number of cups, and "P" for the price you charge.
c. Assume the function is linear.

3. Continuing our lemonade stand question:
a. We all know that total revenue (TR) is a function of the price we charged (P) multiplied by the item quantity sold (in our case – Cups), i.e., TR = Price * Cups
b. Please write the equation for your TR by inputting your answer from the function you have calculated in question #2.
c. What price would maximize your TR?

Click here to see answer by stanbon(57422)

Question 228256: solve by the substitution method.
5x + 9y = -13
x = 10 - 6y
Click here to see answer by JenniferTutors(83)

Question 228352: What eqation do I need to use for the sum of page numbers on facing pages is 285, find larger number? Please help
Click here to see answer by checkley77(12569)

Question 228486: how do you solve this by elimination?
x+y=2
2x-y=-5
Click here to see answer by drj(1380)

Question 228576: 2r-75=-5
7r+2s=9
solve with elimination method
Click here to see answer by checkley77(12569)

Question 228648: 3x-y=7, y=4x-11
Click here to see answer by drj(1380)

Question 228678: solve using any appropriate method.
5x-9y=7
7y-3x=-5
i rearranged the eqaution so as follows.
5x-9y=7
-3x+7y=-5
then i found a common from 5x and -3x (15)
15x-27y=21
-15x+35y=-25
0 + 8y=-4
8y/8 = -4/8
y = .5
then im lost
Click here to see answer by jim_thompson5910(28598)

Question 228772: Hello, Im in Gr.10.
Solving Problems dealing with linear systems: (I need to make an equation then solve)
1) A school athletic council sold 835 tickets to the championship football game for a total of $5792. Students pay $4 and nonstudents pay $8. How many nonstudents attended the game?
Click here to see answer by ankor@dixie-net.com(15667)

Question 228811: Gr.10 math.
Solving Problems dealing with linear systems: ( I need to make an equation, then solve)
2) A truck rental company offers two daily rental plans.
PLAN 1: $65 per day, with unlimited mileage.
PLAN 2: $30 per day, plus 20cents/km
Under what condition(s) is Plan 2 better than Plan 1??
Click here to see answer by rfer(12678)

Question 228854: I don't know how to set this up:
Bill leaves his house for Maya's house riding his bicycle at 8 miles per hour. At the same time, Maya leaves her house heading toward Bill's house walking at 3 miles per hour. Write a system of equations to represent the distance, d, each is from Maya's house in h hours. They live 8.25 miles apart.
Click here to see answer by edjones(7569)

Question 228975: solve by the substitution method
8m + n = 11
m - 6n = 32
Click here to see answer by Alan3354(30993)

Question 229050: w=.5at squared

Click here to see answer by rapaljer(4667)

Question 229038: 6x-2y= -4 What would I need to do to find the answer

Click here to see answer by 121086(1)

Question 229223: substitution and elimination
2x+y=-5
-x+3y=6
Click here to see answer by checkley77(12569)

Question 229220: solve linear system
3x-y=-2
5x+2y=15
Click here to see answer by checkley77(12569)

Question 229415: 11b/6=b-5

Click here to see answer by drj(1380)

Question 229733: Find the slope of the line 4x=5y+2
Click here to see answer by solver91311(16897)

Question 229733: Find the slope of the line 4x=5y+2
Click here to see answer by Alan3354(30993)

Question 229941: x-2y=3
5x+4y=8
Click here to see answer by drj(1380)

Question 229991: The sum of the digits of a two digit number is 12. (So, I am thinking the problem for that statement would be x + y = 12)
The number is 13 times the tens digit. Find the number.
I cannot for the life of me figure out the second equation. If I am given the equation, I can work the problem, but I can't seem to understand anything other than 13(x) = z. (But if I use that, I will then have 3 variables in a systems of equations problem.)
Help!
Marie
Click here to see answer by ankor@dixie-net.com(15667)

Question 230279: Two cyclists begin traveling in the same direction on the same bike path.
One travels at 20 miles per hour, and the other travels at 14 miles per hour.
After how much time will the cyclists be 15 miles apart?

Click here to see answer by checkley77(12569)

Question 230397: a/bx-c=o solve for x
Click here to see answer by stanbon(57422)

Question 230499: Solve the following system of equations for x and y
3x+5y=21
2x-y=1
Click here to see answer by rfer(12678)

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