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

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Question 22339: "You plant a 14 in hemlock tree in your backyard that grows at a rate of 4 in a year and a 8 in spruce that grows 6 in a year. In how many years will the plant be the same height? How tall will each tree be?". Please help!
P.S. Solve it as a linear equation.
Click here to see answer by Paul(988)

Question 22432: Find the y-intercept of a line that passes through (-6,-2) and has a slope of 5/9
Click here to see answer by Paul(988)

Question 22480: which of the following equations is a linear function?
a. y=/x/
b. y=1/x
c. y=x exponent 2-3
d. y=-x+5
Click here to see answer by stanbon(75887)

Question 22547: hi i need help on solving linear equations. i know nothing about them. im in 8th grade and ive gotten help with stuff before on your site but i didnt understand so please use 8th grade terms thank you
Click here to see answer by ilana(307)

Question 22551: hi im in 8th grade and i know nothing about solving decimal equations. and if you could can you wright it so i can understand thankyou
Click here to see answer by elima(1433)

Question 22553: hi need help on solving multistep equations. please help me
Click here to see answer by elima(1433)

Question 22634: hi im in 8th grade and i need help with linear equations can you help me understand them and can you tell me how to do them heres one 6(8+3a)=-2(a-4) thankyou
Click here to see answer by stanbon(75887)

Question 22645: Are these following equations linear?
Y = 3 ( x) to the second power yes or no
Y = 4z(2)to the second power plus six yes or no
Y = negative 1/3x - 9 yes or no
Y = x(3)to the third power yes or no
Click here to see answer by ReBeLgUrLiE(2)

Question 22649: Bethany plans to collect and save the new Eisenhower coins worth one dollar. Her grandmother gave her 20 coins to start her collection. Each week at the Post Office, her father gets 4 coins in change from the vending machines and gives them to Bethany. Bethany realized that the total number of coins, y, she has in her collection after x weeks can be caculated by the function y = 4x + 20.
Is the domain of the function best described as all real number, all integer, all whole numbers, or all whole numbers greater than 20?
Click here to see answer by stanbon(75887)

Question 22635: hi i need help on solving equations with variables on both sides im in 8th grade so can you show me how to do them using 8th grade terms heres one
6y-3y+6=5y-4 thankyou
Click here to see answer by ReBeLgUrLiE(2)

Question 22639: Can someone tell me whether or not this equation is a linear equation in 2 variables> Can you explain this a little to me to. I don't really understand.
x = 5
Click here to see answer by longjonsilver(2297)

Question 22714: How do you find the x and y intercept of the graph of 4x-7y =14
Click here to see answer by stanbon(75887)

Question 22712: Please explain to me how i am supposed to graph this equation: 1.5x+y =4
Click here to see answer by stanbon(75887)

Question 22664: I need help on this question.
4.4s+6.2=8.8s-1.8
Click here to see answer by WoWLeaky(10)

Question 22679: simply
(2n+5)-(n-2)

Click here to see answer by WoWLeaky(10)

Question 22653: What is the slope of the line whose ordered pairs are given in the table?
( Okay, this is a chart that I am reading off of.) In the x row it has -3,3,6, and in the y row it has 5, 7, 8. So bascially, it is -3,5, 3,7, and 6,8. What IS the slope of the line whose ordered pairs are given in the table?
Click here to see answer by queenofit(120)

Question 22652: What is the x - intercept for the function y = -5x + 9?
Click here to see answer by queenofit(120)

Question 22650: What is the range of the function f(x) = -x - 3, when the domain is {-1, 0, 4, 7}?
Click here to see answer by rapaljer(4671)

Question 22838: I was doing a test in algebra and I wanted to know how to slove this, it takes 1/2 a gallon of paint to fill 530 square feet of a wall and 3/4 of a gallon to fill up 735 sqaure feet of a wall it also says write an equation to find out how many gallons you need to fill up a certain amount of space in a wall let g be gallons, s for square feet.
Click here to see answer by venugopalramana(3286)

Question 22858: 5(2-x)/6 = x+6/2 Trying to teach myself algebra from text. If you would do this one step by step, I would really appreciate it. Thanks
Click here to see answer by stanbon(75887)

Question 22986: solve the system of linear equations using the guass-jordan method.
x-2y=8
3x+4y=4

Click here to see answer by ks(2)

Question 23035: i need help on solving linear equations can anyone help me?

1. 3/4(24-20t)+9t=2(5t+1)
2. 7(b+2)-4b=2(b+10)
3. 2(6-2x)= -9x-1/2(-4x+6)
thank you
ps. im in 8th grade
Click here to see answer by rapaljer(4671)

Question 22554: hi need help on solving equations with variables on both sides im in 8th grade so please write it so that i can understand thank you
Click here to see answer by rapaljer(4671)

Question 23072: Hi, I need to do problem on linear programming and answer all those questions bellow the problem. This is a problem: A manufacturer produces two kinds of radios.
Model X takes 4 hours to produce, cost $8 in production, and sells for $15
Model Y takes 3 hours to produce, cost $7 in production, and sells for $12
If manufacture allots a total of 58 hours and $126 per week to produce radios, find his maximum income. How many of each model will produce this maximum profit?

X stands for: I think x stand for number model X radios will produces

Y stands for: I think y number model Y radios will produces
Constraint Equations:
8x+ 7y
15x+12y
I think if I know how to create equation then I will be able to to graphs
Objective Function:
Corner Coordinates:
Work shown in checking Coordinates:
Correct answer in a sentence
Graph

Click here to see answer by stanbon!(97)

Question 23134: Sir, pl. help to solve this simple interest question.
A man borrowed Rs. 80,000 from a bank at rate 7% per annum. After 2 years, he returned Rs. 30,000. How much balance amount he has to pay at the end of 5th year. Ans is Rs. 71700.
Click here to see answer by stanbon!(97)

Question 23165: the math problem is : b+5=3b-9
Click here to see answer by stanbon(75887)

Question 22106: The tens digit of a two-digit number is 3 times the units digit. The diference of the digits is 6. What are the 2 equations?
Click here to see answer by rapaljer(4671)

Question 22347: i have to determine whether each equation is a linear equation. if so, write the equation in standarad form (6+y=8)
Click here to see answer by stanbon(75887)

Question 23176: I can't figure out these problems i keep getting different answers everytime i solve them.
Identify the type of system of equations for the system below:
2y=4-6x
3y+9x=6

Identify the system of equations which has no solution.
a. 5x+2y=4
2x-2y=10
b. -x=3y+1
x=3y-1
c. x-2y=-6
2x=4y-12
d. x=2y-1
2x=4y
Click here to see answer by stanbon(75887)

Question 22279: How would I solve these systems?
1)x+5y=4
3x-7y=-10

2)-5x+3y=6
x-y=4

3)3x-8y=13
4x-5y=6

4)3x-7y=6
2x+7y=4

5)4x+3y=19
3x-4y=8

6)2x+y=5
3x-2y=4

7)3x-2y=19
5x+4y=17

8)7x+3y=-1
4x+y=3

9)8x-3y=-11
2x-5y=27

10)4x-7y=10
3x+2y=-7
Click here to see answer by elima(1433)

Question 21174: Hi..I have one more problem..and I don't even know where to start..
I'm given..
A=[0, -1, 0, 4, 0, 2, 8, 1, 7]; B=[2, 1, -3, 4, 1, 6]
(a) Find 3A-2B
(b) Find AB
Please help!
Cecilia
Click here to see answer by venugopalramana(3286)

Question 22010: name the variable you would solve for first: 3x-y=-9;2x+4y=8
p.s. this is using the substitution method
Click here to see answer by rapaljer(4671)

Question 20999: y=x+2
Click here to see answer by rapaljer(4671)

Question 23254: Please help, this one is too much! Solve using the substitution method.
7x + y = 14 and 2x - 5y = -33

Click here to see answer by stanbon(75887)

Question 23252: Please explain how to get the answer for:
(4x+3)(3x-1)-(5x-3)(x+2)=(7x+9)(x-3) The answer is -3 but I get stuck half way through...Thanks very much
Click here to see answer by stanbon(75887)

Question 23270: Can you help me solve a system of equations by graphing (just explain the steps) for the following system. Can you give the x- and y-intercepts and the slope of each equation? Thanks.
x-3y=-14; 3x+8y=26
Click here to see answer by stanbon(75887)

Question 23305: How do you know how to plug the point onto the graph. For example if the equation is 2x+3=7 the answer will be x=2. How do you plug that in without a y, because if there is an x there needs to be a y, but the answer just ends up x=2.
Click here to see answer by stanbon(75887)

Question 23376: I have two questions I just don't get them.
Solve the system of linear equations by graphing: x+2y=5
x-y=2
that is the first one
the second one is: 4x-y=6
3x+y=1
these are very hard for me please help
Click here to see answer by venugopalramana(3286)

Question 23518: why is the solver just addition? why isnt there a choice for subtraction
Click here to see answer by MathNerdette(3)

Question 23518: why is the solver just addition? why isnt there a choice for subtraction
Click here to see answer by elima(1433)

Question 23624:
Click here to see answer by kviji_85(2)

Question 23624:
Click here to see answer by Earlsdon(6294)

Question 23704: How can i figure these linear equations out they are so confusing. For example, trying to find three ordered pairs, why three??
ex: y = 7- 4x
PLEASE HELP ME ASAP THANKS : )
Click here to see answer by rapaljer(4671)

Question 23661: what is the answer for these problems. Iam having diffcult with just these, please show work and use sub. or eilm. thanks.
1. x-9y=237
5x+3y=-267

2. x-4y=119
16y--432

3. 4x+5y=1
14x+5y=191

4. 8x+y=74
3x+19y=363

5.9x+17y=-475
7x+11y=-285

6. 9x+13y=536
9x+16y=587

7. 10x-y+-145
13x+3y=-339

8. 17x-8y+=154
17x-12y+=150

9. 11x-4y=364
2x-19y=322

10. x+2y=47
x-3y=7

11. 3x-4y=-198
x-3y=-111

12. 12x+13y=491
12x+19y=629

Click here to see answer by elima(1433)

Question 23716: Please solve by addition method:
3x - 4y = 9
-3x + 4y = 12
Click here to see answer by rapaljer(4671)

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