Tutors Answer Your Questions about Linear-systems (FREE)
Question 699209: Ok i have missed 18 days of school. So im completely lost on this. Im trying to get work done today since its the last day before we go back to school from holiday break. It says a Chemist has a beaker of a 3% acid solution and a beaker of 7% acid solution. He needs to make 75 mL of a 4% acid solution. He wants me to make a table makeing a equation. B) says use the information in the table to write a system of equations. C) says solve the system of equations to find how much he will use from each beaker
Click here to see answer by solver91311(24713)   |
Question 699724: Please help me solve this equation by using substitution. Here is the problem...
1.2x-y=-3
x+y=9
Below is the work that I did to attempt the problem, but i know its not correct.
x+y=9
x=9
(9)2x=18
x=18
18-y=-3
-18
y=-21
18-21=-3
Click here to see answer by stanbon(75887) |
Question 699728: Please help me solve these equations. I have attempted to understand them but it has been to much. It would help so much if you solve showing step by step. Solve the systems of linear equations by using substitution.Thank you.
1. 7x-3y=-23 2. x-y=3 3. x-y=3 4. 7x+2y=24
x+5y=32 2x-2y=6 2x-2y=6 x+2y=0
Click here to see answer by stanbon(75887) |
Question 699811: Hi,
the question is: solve each question by graphing. Graph each equation.
the two equations given are
1) 2x-2y=5
2) y=x-4
in the first equation y and x are on the same side, i only know how to do it when the equation equals y (like in the second equation) because, like in the second equations the x would be the slope and the -4 would be the y-intercept so in an equation like the first one i was wondering which one is slope and which one would be the y-intercept because i couldnt figure it out.
Click here to see answer by solver91311(24713) |
Question 699652: Please help me! I need to solve this word problem using the eliminating method.
A steamboaat went 8 miles upstream in 1 hour. The return trip took only 30 minuts. Assume that the speed of the current and the direction were constant during both parts of the trip. Find the speed of the boat in still water and the speed of the current.
Click here to see answer by ankor@dixie-net.com(22740)  |
Question 700224: I was trying to find the correct term, but I couldn't find it. What I need help on is "Solving systems by graphing" I understand it perfectly, just not when the equation is like this. y=2x. How am I supposed to find the slope for this? I use the formula y=mx+b .. I don't know how to solve it when it's in that format. Please help for that one problem so I won't have any trouble solving it in the future. Please & thank you!
Click here to see answer by solver91311(24713) |
Question 701030: Hi my name is Matt and i'm in desperate need of help! In 2 weeks we are having finals at my school and we are currently reviewing all the chapters we have covered. We are now going over solving systems by substitution.
One of the problems is: y=x+3
y=2x+4
Another is: y=2x+10
y=-2x-6
Click here to see answer by solver91311(24713) |
Question 701030: Hi my name is Matt and i'm in desperate need of help! In 2 weeks we are having finals at my school and we are currently reviewing all the chapters we have covered. We are now going over solving systems by substitution.
One of the problems is: y=x+3
y=2x+4
Another is: y=2x+10
y=-2x-6
Click here to see answer by josmiceli(19441)  |
Question 701127: An ice skating arena charges an admission fee for each child plus a rental fee for each pair of ice skates. John paid the admission fees for his six nephews and rented five pairs of ice skates. He was charged $32.00. Juanita paid the admission fees for her seven grandchildren and rented five pairs of ice skates. She was charged $35.25. What is the admission fee? What is the rental fee for a pair of skates? Write a system of equations to find the admission and rental fees. Identify the variables, write the equations, and solve the system using Elimination or Substitution methods. Write complete Answers. Show all your work step by step. Write a short explanation about why you chose the best method to solve the problem.
Click here to see answer by checkley79(3341) |
Question 701124: A jar containing only nickels and dimes contains a total of 14 coins. The value of all the coins in the jar is $1.10. Write and graph a system of equations to find the amount of nickels and dimes that are in the jar. Identify the variables, write the equations, and solve the system using Graphing, Elimination, and Substitution methods. Write complete answers. Show all your work step by step. Write a short explanation about which will be the best method to solve the problem.
Click here to see answer by lynnlo(4176) |
Question 701130: Kevin operates a soybean farm. He buys many supplies in bulk. Often the bulk products need to be custom mixed before Kevin can use them. To apply herbicide to a large field he must mix a solution of 67% herbicide with a solution of 46% herbicide to form 42 liters of a 55% solution. How much of the 67% solution must he use? Write a system of equations to find how much of the 67% solution must he use. Identify the variables, write the equations, and solve the system using Elimination or Substitution methods. Write complete Answers. Show all your work step by step. Write a short explanation about why you chose the best method to solve the problem.
SHOW ALLLL WORK PLEASE!!!!!!!!!!!!
Click here to see answer by lynnlo(4176) |
Question 701129: A doctor’s office schedules 10-minute and 20-minute appointments. The doctor also makes hospital rounds for four hours each weekday.
a. Suppose the doctor limits these activities to, at most, 30 hours per week. Write an inequality to represent the number of each type of office visit she may have in a week. Let x represent the number of 10-minute appointments and y the number of 20-minute appointments.
b. Graph the inequality.
c. Is (63, 30) a solution of the inequality?
SHOW ALLLLLL WORK PLEASE!!!!!!!!!!!
Click here to see answer by lynnlo(4176) |
Question 701186: Kevin operates a soybean farm. He buys many supplies in bulk. Often the bulk products need to be custom mixed before Kevin can use them. To apply herbicide to a large field he must mix a solution of 67% herbicide with a solution of 46% herbicide to form 42 liters of a 55% solution. How much of the 67% solution must he use? Write a system of equations to find how much of the 67% solution must he use. Identify the variables, write the equations, and solve the system using Elimination or Substitution methods. Write complete Answers. Show all your work step by step. Write a short explanation about why you chose the best method to solve the problem.
SHOW ALLLL WORK PLEASE!!!!!!!!!!!!
Click here to see answer by checkley79(3341) |
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