Tutors Answer Your Questions about Linear-equations (FREE)
Question 112166: Solve the system by addition.
–4x + 7y = –10
x – 5y = 9
what am i doing wrong here?
-4x + 7y= -10
4(x -5y) = 36
4x – 20y = 36
-13y = 26
___________
-13 -13
Y= -13
-4(x) + 7(-13) =-10
-4x + -91 = -10
+91 +91
-4x = 81
__________
-4 -4
X= - 20.25
Click here to see answer by MathLover1(20849)   |
Question 112185: I am working on a problem that I need some help on.
Here it is: Geometry. The length of a rectangle playing field is 5 ft. less than twice its width. If the perimeter of the playing field is 230 ft., find the length and width of the field.
What I have so far is this equation; 2x+2(2x-5)=230?
Am I off to a good start here or not getting it? Thank you for your help.
Barb Neely
Click here to see answer by jim_thompson5910(35256) |
Question 112244: I am working on a problem and I believe that I have come up with an answer, I would appreciate your input please.
Martina leaves home at 9am., traveling at a rate of 24mi/h. Two hours later, John leaves, driving at a rate of 48mi/h. At what time will John catch up with Martina?
Now I realize that John is traveling at twice the rate of speed as Martina is, so would I solve this by subtracting the difference between the rate of speed or would I add the two rates of speed. I believe that John will catch up to Martina at 12 noon.
Would the equation go something like this: T=RS (time=rate and speed)?
Click here to see answer by rapaljer(4671)  |
Question 112244: I am working on a problem and I believe that I have come up with an answer, I would appreciate your input please.
Martina leaves home at 9am., traveling at a rate of 24mi/h. Two hours later, John leaves, driving at a rate of 48mi/h. At what time will John catch up with Martina?
Now I realize that John is traveling at twice the rate of speed as Martina is, so would I solve this by subtracting the difference between the rate of speed or would I add the two rates of speed. I believe that John will catch up to Martina at 12 noon.
Would the equation go something like this: T=RS (time=rate and speed)?
Click here to see answer by checkley71(8403) |
Question 112205: Hi, here is an science and medicine word problem that I think I have worked out and I would appreciate your input.
A chemist has 300 milimeters(mL)of solution that is 18% acid. How many milimeters of acid are in the solution?
What I have come up with is this;
300x=18
x=18/300
x=0.06%
The answer I have is; 6% mL of acid are in the solution. Am I correct on this one.
Thank You, Barb Neely
Click here to see answer by BrittanyM(80) |
Question 112392: The speed of the current in a river is 2mph. Jay travels 20 miles upstream and then 20 miles downstream in a total of 5 1/3 hr. Find the speed of his boat.
- I know that the distance formula is supposed to be used to find this answer but i just cannot get it right. d=r.t
Click here to see answer by checkley71(8403) |
Question 112528: Problem: 5x +6y = 18 for y
Answer: y = 3-(5/6)x
When graphed this equation would be a line. By examining your answer to part a, what is the slope and y-intercept of this line?
Slope = ______
Y-intercept = _____
Using your answer from part a, find the corresponding value of y when x =12.
Click here to see answer by ptaylor(2198)  |
Question 112744: I do not have the ISBN # because my chapter is printed off since I am going to school on-line. I would appreciate some help on this problem please.
Sam must have an average of 70 or more on his summer course to obtain a grade of C. His first three test grades were 75, 63, and 68. Write an inequality representing the score that Sam must get on the last test to get a C grade.
I believe that the answer is a 69 for the final score. What I did was added the 3 scores and divided by 3, I hope this was right but I am unsure how to write it into an inequality.
Thank You,
Barb Neely
Click here to see answer by mathnard(10) |
Question 112868: The problem says to:
Solve the system of linear equations.
-3x-6y=5
4x+8y=5
I think that my teacher wants me to use the multiplication method. Like when you multiply one of the equations by something so that the y's or x's are exact opposites so they can add together and be solved. I just can't figure out what to add, nothing seems to work evenly.
<3 Alyssa
Thanx for taking the time to read this!!!
Click here to see answer by scott8148(6628)  |
Question 112797: Jane invested some amount at the rate of 12% simple interset and some other amount at the rate of 10% simple interest. She recieved yearly interset of $130. Randy also invested in the same scheme, but he interchanged the amounts invested, and recieved $4 more as interest. How muchamount did each of them invest at different rates?
Click here to see answer by ankor@dixie-net.com(22740)  |
Question 113006: I am trying to write an equation in slope-intercept form. I know how to find the slope if I am given 2 points, but once I have the slope, I don't know how to find the y intercept. I am using a this form (((y=mx+b))) How do I find b?
Click here to see answer by Earlsdon(6294) |
Question 112786: An art dealer sold two art works for $1520 thereby making a profit of 25% on the first work and 10% profit on the other,whereas if he had approached any exhibition he would have sold them together for $1535 with a profit of 10% on the first and 25% on the other artwork. Find the actual cost of each artwork.
Click here to see answer by ankor@dixie-net.com(22740) |
Question 113170: points 60, $1635 120, $1770 I got a slope of 2.25 My intercept is 1,500. Not sure if this is right. Let x represent packages and y cost. What is the cost to send 200? What would my equation look like? Thanks
Click here to see answer by stanbon(75887) |
Question 113203: I need help on the following questions:I am having a hard time with finding slopes and writing the following equations. I would really appreciate your help,thank you in advance.
1.Find the slope of the line passing through the points (-3,1) and (-6,10)
2. Write the equation of the line with slope -5 and y intercept (0,5)
3. Write the equation of the line with x-intercept (-1,0) and undefined slope
Click here to see answer by solver91311(24713)  |
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