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

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Question 108022: Write an equation of a line that is perpendicular to y= -3/4x + 2 and passes through (-4,1)
Click here to see answer by checkley71(8405)

Question 108081: solve system by addition, then state Y value
x+y=28
x-y=12
Click here to see answer by checkley71(8405)

Question 108048This question is from textbook Algebra 1
: use substitution to solve each system of equations. if the systemdoes not have exactly one solution,state whether it has no solution or infintely many solutions?This question is from textbook Algebra 1

Click here to see answer by elima(1433)

Question 108208: What is the anser of if the coordinates are (2,6) and the slope is -1?
Click here to see answer by checkley71(8405)

Question 108238: daughter needs help, and so do i apparently, sure would like to know the procedure for solving this: 8y+5z=4390
y+z= 680 , any help is more that appreciated,
thanx phil
Click here to see answer by stanbon(26259)

Question 108198: please help me solve this equation:
x-3y=0
2x+3y+3z=18
x+2y-4z=10
Click here to see answer by scott8148(3382)

Question 108215: a train averaged 36 miles per hour and took 8 hours to travel from chicago to st.louis. what is the distance between chicag and st.louis?
Click here to see answer by elima(1433)

Question 108261: Kevin works 3 times as many hours in a week as Karen does. If each were to work 6h more per week, Kevin would be working twice as many hours as Karen does. How many hours does each work now?
Click here to see answer by wgunther(43)

Question 108384: Given f(x) = –x3 – 3x2 + 3x + 7, find f(–1), f(0), and f(2)
Click here to see answer by elima(1433)

Question 108482: Solve the system by addition.
4x – 6y = –1
8x + 3y = 3

Click here to see answer by elima(1433)

Question 108612: how would you do 6x+5=29? can you break it down for me? thank you =]
Click here to see answer by stanbon(26259)

Question 108615: How do we determine which method is better for graphing a system?
Click here to see answer by anne(47)

Question 108748: 1} x+2y=1
2} 2x+y=5
Click here to see answer by elima(1433)

Question 108868: Find the mean and the median.
–7, –1, 3, 9, 10, 16

Click here to see answer by checkley71(8405)

Question 108867: Solve the system by addition or substitution.
3x – 4y = 8
6x – 2y = 10

Click here to see answer by checkley71(8405)

Question 108869: Combine like terms.
6a2 + 4a + 5 + 3a2 + 7a – 2

Click here to see answer by stanbon(26259)

Question 108938: How do I do a linear equation of
a+d=100
1.00a+1.50=120
can you give me the steps to do so.
Click here to see answer by Fombitz(2113)

Question 109118: Find the slope of the line passing through the points (14, 6) and (9, 1).
Click here to see answer by jim_thompson5910(13787)

Question 109165This question is from textbook
: Gail and Bill drove to a beach at an average speed of 50 mi/h. They returned home over the same road at an average speed of 55 mi/h. The trip home took 30 min less time. How far is the beach from their home?This question is from textbook

Click here to see answer by stanbon(26259)

Question 109163This question is from textbook
: Starting one hour later, Jonathan sets out walking at 8 km/h to overtake his little sister who averages 5 km/h. How long woll it take Jonathan?This question is from textbook

Click here to see answer by ankor@dixie-net.com(6691)

Question 109228: Ken bought three chocolate bars and a pack of gum and paid $1.75. Sally bought two chocolate bars and four packs of gum and paid $2.00. Find the cost of a chocolate bar and the cost of a pack of gum.

3x +1y =$1.75
2x + 4y = $2.00
I know I have to multiply the second equation by a number in order to eliminate the variable x when added but I can't figure what number to use that will equal 3x. Please help
Click here to see answer by jim_thompson5910(13787)

Question 109230: One number is 12 more than a another. the sum of the smallest number and twice the larger number is 39. find the larger number
x + 12 = y
x + 2(y)= 39
Am I on the right track for solving this problem?
Click here to see answer by jim_thompson5910(13787)

Question 109231: Paul invested $5000 in a time deposit. What interest will he earn for 1 year if the interest rate is 6.5%
Click here to see answer by HyperBrain(694)

Question 109277This question is from textbook College Algebra
: Hi, I am looking for some help with this problem, thanks in advance:
Draww the graph of each function;
y= -(x-2)^2This question is from textbook College Algebra

Click here to see answer by edjones(3291)

Question 109400This question is from textbook
: The sum of two numbers is 111, and their difference is 63.
What are the two numbers?
*what is the formula?This question is from textbook

Click here to see answer by jim_thompson5910(13787)

Question 109328: Hi sir, i am really confused with the sum and need immediate help .
Q.A rabbit costs $3.50 , ducklings are sold at 3 for $1 and chicks cost 50 cents each . A farmer paid $100 exactly for 100 of these animals . How many of each did he buy ? (There are 5 possible answers.)
I am getting (20,60,20)
Sir pls help me . THANK YOU
Click here to see answer by ptaylor(1578)

Question 109479: How do you do this system of equation:
3x+5y=56
y= 66-8y / 5

Click here to see answer by MathLover1(1183)

Question 109527: hiya!! please can you help me with formula please!it is 3x+5 divide by 2 and then times by 3 >>i do not know how to do it ive tried many ways but still think i got it wrong xxxxthank you
Click here to see answer by edjones(3291)

Question 109588: When a no is divided by 4 and has 28 added to it , the result is equal to twice the no. . Find the no ?
Pls help me . I can't form apropriate eqn for this ans .
THANK U.
Click here to see answer by Fombitz(2113)

Question 109706This question is from textbook
: Two hikers start walking in opposite directions from a camp at the same time. The average rate of the northbound hiker is 3 mi/h faster than the rate of the southbound hiker. If they are 22 moles apart after 2 hours, what is the rate of each hiker?This question is from textbook

Click here to see answer by checkley71(8405)

Question 109733: Find 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
Thanks for any help you can give
Heather
Click here to see answer by josmiceli(3003)

Question 109736: Solve the following by addition. If a unique solution does not exist, state whether the system in inconsistent or dependent.
x + 5y = 10
-2x - 10y = -20
I appreciate any help
thanks
Heather
Click here to see answer by scott8148(3382)

Question 109855This question is from textbook beginning algebra

: 5x-2y=-5
y-5x=3This question is from textbook beginning algebra

Click here to see answer by MathLover1(1183)

Question 109873This question is from textbook Beginning and Intermediate Algebra
: A small company keeps track of its monthly profit in relation to the number of workers they employ. Let x represent the number of employees, and let y represent the monthly profit where each unit in y represents $1,000 in profit. The following ordered pairs describe the profit:
(8,16), (10,21), (11,21), (15,9).
Interpret the meaning of the ordered pair (11,21).
* With 21 employees, the company makes a profit of $11,000.
* With 11 employees, the company makes a profit of $21.
* With 21 employees, the company makes a profit of $11.
* With 11 employees, the company makes a profit of $21,000.This question is from textbook Beginning and Intermediate Algebra

Click here to see answer by jim_thompson5910(13787)

Question 109869This question is from textbook Beginning and Intermediate Algebra
: Write the equation of the line through [-17/3, 8/5] that is parallel to the x-axis.
* -17/3x+8/5y=0
* y=-17/3x+8/5
* x=-17/3
* y=8/5
This question is from textbook Beginning and Intermediate Algebra

Click here to see answer by jim_thompson5910(13787)

Question 109906: I need some help PLEASE!!!!
solve each of the following by substitution
8x-4y=16
y=2x-4
Thanks
Heather
Click here to see answer by tutorcecilia(2042)

Question 109916: I need to solve this problem and show solution used....HELP!!!!
The length of a rectangle is 2 in more than twice its width . If the perimeter of the rectangle is 34 in find the dimensions of the rectangle.
thanks alot
Heather
Click here to see answer by checkley71(8405)

Question 109909: I need some help PLEASE!!!!
solve each of the following by substitution
4x-12y=5
-x+3y=-1
Thanks
Heather
Click here to see answer by ptaylor(1578)

Question 109905: Solve each of the following by substitution
5x-2y=-5
y-5x=3
Thanks for any help!!!
Heather
Click here to see answer by vidhyak(78)

Question 109868This question is from textbook Beginning and Intermediate Algebra
: In football, the hangtime of a punt is how many seconds after it's kicked that the ball returns to ground level. The height of one particular punt is given by:

y=-16x2 +80x
where y is in feet, and x is secinds after the puntWhich intercept tells us the hang time of the punt, and what is it?
*x-intercept: 0 seconds
*x-intercept: 5 seconds
*y-intercept: 5 seconds
*y-intercept: 3 secondsThis question is from textbook Beginning and Intermediate Algebra

Click here to see answer by ankor@dixie-net.com(6691)

Question 110073This question is from textbook Beginning Algebra

: I need help solving this problem by graphing 2x-y=4 and 2x-y=6 this problem your help will be greatly appreciated!!This question is from textbook Beginning Algebra

Click here to see answer by stanbon(26259)

Question 110073This question is from textbook Beginning Algebra

: I need help solving this problem by graphing 2x-y=4 and 2x-y=6 this problem your help will be greatly appreciated!!This question is from textbook Beginning Algebra

Click here to see answer by MathLover1(1183)

Question 110068: a man rode a bycycle for 12 miles then hiked an additional 8 miles . the total time for the trip was 5 hrs . if the rate when he was riding his bicycle was 10 miles per hour faster than his rate walking , what was each rate
Click here to see answer by stanbon(26259)

Question 110139This question is from textbook Beginning Algebra

: Could you please tell me if I did some of this problem correct? It says to find the values for m and b the solution to the system is (-3,4).
5x+7y=b
mx+y=22
so I did this 5(-3)+7(4)=b b=5(-3)+7(4), b=-15+28, b=13, but I don't know what to do with mx+b=22???
Thanks you for your help!!This question is from textbook Beginning Algebra

Click here to see answer by stanbon(26259)

Question 110139This question is from textbook Beginning Algebra

Click here to see answer by ankor@dixie-net.com(6691)

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