Tutors Answer Your Questions about Linear-systems (FREE)
Question 141361: How do I solve using a system of two equations in two variables?
The sum of the digits of a two-digit number is 9. The value of the number is 12 times the tens digit. Find the number.
I think the first equation is x+y=9
Click here to see answer by checkley77(12844)  |
Question 141416: How do i solve using two equation with two variables?
Jennifer is 6 years older than Sue. In 4 years, she will be twice as old as Sue was 5 years ago. Find their ages now.
My teacher said the answers are not 8 & 14.
Click here to see answer by scott8148(6628)  |
Question 141500: I am so stuck! How do I solve using two equations with two variables?
The tens digit of a two-digit number is twice the units digit. If the digits are reversed, the new number is 36 less than the original number. Find the number.
Click here to see answer by solver91311(24713)  |
Question 142693: Hello, I've got to solve this word problem using a system of linear equations and I do not know where to begin, it seems to me like all the variables are just not there. Any help would be appreciated. Thank you in advance.
A bricklayer and an electrician together spend 90 hours working on a new house. If the bricklayer earns $12 per hour, the electrician earns $16 an hour, and the owner pays them a total of $1350 for their work, how many hours does each worker spend on the house?
Click here to see answer by stanbon(75887) |
Question 142702: Could someone please help me with this word problem, this problem needs to be solved by using systems of linear equations. Thank you in advance for your help.
In a triangle, the sum of the interior angles is 180 degrees. If angle A is three times as large as angle B, and angles B and C sum to 90 degrees, what is the measure of each angle?
Click here to see answer by stanbon(75887) |
Question 142764: I know how to solve a linear equation with three variables by using two of the three equations to eliminate one variable and then use a different pair of equations to eliminate the same variable and then you can solve those equations. I am doing some word problems and writing the first two equations with three unknown variables is easy but I cannot seem to write the third.
Mike has 19 coins (nickels, dimes and quarters) in his piggy bank with a total value of $2.35. There are 2 more dimes than nickels. How many of each type does Mike have?
N+D+Q=19
5N+10D+25Q=235
?
With the first two I can multiply the first by –5 to eliminate N. I need another equation. Help?
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Fred, Tiger and Nancy play a round of golf together. Their combined score is 223. Fred’s score was 3 more than Nancy’s and Tiger’s score was 7 more than Fred’s. What was each person’s score.
You would think something simple like
F=N+3
T=F+7
223=T+F+N
But I need three equations with three unknown variables.
Click here to see answer by stanbon(75887) |
Question 142764: I know how to solve a linear equation with three variables by using two of the three equations to eliminate one variable and then use a different pair of equations to eliminate the same variable and then you can solve those equations. I am doing some word problems and writing the first two equations with three unknown variables is easy but I cannot seem to write the third.
Mike has 19 coins (nickels, dimes and quarters) in his piggy bank with a total value of $2.35. There are 2 more dimes than nickels. How many of each type does Mike have?
N+D+Q=19
5N+10D+25Q=235
?
With the first two I can multiply the first by –5 to eliminate N. I need another equation. Help?
----------------
Fred, Tiger and Nancy play a round of golf together. Their combined score is 223. Fred’s score was 3 more than Nancy’s and Tiger’s score was 7 more than Fred’s. What was each person’s score.
You would think something simple like
F=N+3
T=F+7
223=T+F+N
But I need three equations with three unknown variables.
Click here to see answer by checkley77(12844) |
Question 142918: I need help with this word problem which needs to be solved using a system of two linear equations. Thank you in advance for your help.
A university bookstore recently sold a wirebound graph-paper notebook for $2.50, and a college-ruled notebook for $2.30. At the start of spring semester, a combination of 50 of these notebooks were sold for a total of $118.60. How many of each type were sold?
Click here to see answer by jojo14344(1513) |
Question 142969: Any help with this system of linear equation would be appreciated.
In a triangle, the sum of the interior angles is 180 degrees. If angle A is three times as large as angle B, and angles B and C sum to 90 degrees, what is the measure of each angle?
Click here to see answer by Earlsdon(6294) |
Question 142968: Any help with this system of linear equations will be appreciated.
A bricklayer and an electrician together spend 90 hours working on a new house. If the bricklayer earns $12 per hour, the electrician earns $16 an hour, and the owner pays them a total of $1350 for their work, how many hours does each worker spend on the house?
Click here to see answer by Earlsdon(6294) |
Question 142967: Could any one help me with this system of linear equation as a word problem. Thank you in advance for your help.
A shopper buys three oranges and five lemons for $10.26, while a second shopper buys four lemons and six oranges for $11.16. What is the price of each fruit?
Click here to see answer by Earlsdon(6294) |
Question 143050: I need the formula to express how much money I would have after 20 years if I start with one dollar and the money doubles every year. My assignment is to put the formula on a spread sheet and generate a graph. I can do that, I just don't know how to come up with the formula.(I've been out of high school for 38 years)
Click here to see answer by scott8148(6628) |
Question 143048: I've been trying to solve this question for about two hours. I just can't seem to get the starting equation right.
Jan has $2000 more invested in a stock that pays 9% interest than in a savings account paying 8%. If her total interest for 1 year is $860, how much does she have invested at each rate?
Click here to see answer by scott8148(6628) |
Question 143217: I'm having problems finding the x & y intercepts for this system. I found the solution but not the intercepts. Any help would be appreciated.
Determine how many solutions exist
Use either elimination or substitution to find the solutions (if any)
Graph the two lines, labeling the x-intercepts, y-intercepts, and points of intersection.
4x = 8 and 5y = 15
4x = 8
x = 2
5y = 15
y = 3
CHECK
4(2) = 8
8 = 8
5(3) = 15
15 = 15
Click here to see answer by scott8148(6628) |
Question 143311: Simplify
8(a+3b)+4(5a-5b)
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Solve
(x+6)2=0
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Classify 8y3 - 5y2 + 3y - 1 by degree AND by number of terms
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Solve
6(12y - 3) + 6y = 9
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Find the product of (x + 2)2, explain how you arrived at your answer in constructed response format.
__________________________________________________________________
Please help this is going to be on my finalnext week!! Thank you!!
Click here to see answer by stanbon(75887) |
Question 143396: I am stuck on this linear equation story problem. I was hoping someone could please help me with the formula that I need.
The Candy Shop wants to create 50 pounds of a holiday mix that will sell for $3.91 per pound. How many pounds of a candy selling for $2.59 per pound should be combined with candy selling for $6.99 per pound to create the desired mix?
Set up a system of equations to describe this situation. Solve the system of equations to find the solution.
This isn't from a book, it is from a problem in one of my online classes. Thanks so much ~Lyn
Click here to see answer by ankor@dixie-net.com(22740)  |
Question 143786: Solve by setting up the proper equation to describe the facts given and then carrying out the mathematical calculations to solve for the unknown variable(s).
The difference between two numbers is 3, and the sum of those two numbers is 21. What are the two numbers?
Click here to see answer by marcsam823(57) |
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