# Questions on Algebra: Equations answered by real tutors!

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 Algebra: Equations Solvers Lessons Answers archive Quiz In Depth

 Question 156119: 3.5x + 24.2 > 60.5 - 8.6x The solution is {x|x > __} Click here to see answer by Fombitz(13828)

 Question 156136: 7x-6 ______ = 5. Please tell me how to work out X. Thanks, Emma xx 10 Click here to see answer by kdr(11)
 Question 156136: 7x-6 ______ = 5. Please tell me how to work out X. Thanks, Emma xx 10 Click here to see answer by checkley77(12569)
 Question 156136: 7x-6 ______ = 5. Please tell me how to work out X. Thanks, Emma xx 10 Click here to see answer by jim_thompson5910(28715)

 Question 156121: x/2 - 1 < 6/7 - The solution is {x|x < __ } - Click here to see answer by oscargut(900)

 Question 156118: 6x - 13 < -43 The solution is {x|x __ __} Click here to see answer by dave41082(4)

 Question 156112: how do you know when an equation has no solution Click here to see answer by nabla(475)

 Question 156113: how do you know when an equation has infinitely many solutions Click here to see answer by nabla(475)

 Question 156170: Hi, I need help . This is linear regression . I have these two lists . Let's say the left side is . Still heartbeat rate ! Racing heartbeat rate ... 50.......................... 166 ... 60.......................... 168 ... 70.......................... 170 ... 80.......................... 172 . I was told to use the first "x" as 0, and base the others on "0" (For example, this is how you would write it in the calculator: 50 = 0, 60 = 10, 70 = 20, 80 = 30 . If you put this in a calculator, using (0,10,20,30)as L1, (166,168,170,172) as L2 . I get the regression line formula, of It has told me to predict . Still heartbeat rate ! Racing heartbeat rate ... 40.......................... ??? ... 65.......................... ??? ... 84.......................... ??? . If I put in the numbers ( -10, 15, 34)(based on the first "50" = 0 . Using the formula . (-10) = = = = . The other solutions are ( 169, and 172.8 ) . Now, I found that if you just use the numbers themselves (50, 60, 70, 80) Instead of (0,10,20,30) . You come up with a different equation . The new equation = ( The book I got this problem from, has this answer/equation) . If I predict the same heart rates ( 40, 65, 84) . If I use the new equation . (40) = = = = . I get the same predictions, so which regression line is correct . (A) . (B) . Is it "A" or "B", my question is, "How do you know which regression line formula is correct?" It can be an infinite number of equations, depending on what you use for "L1" . Do you only use the First Number in list as "0" if it is a year? . Thanks ahead of time, Levi Click here to see answer by stanbon(57967)

 Question 156306: A cellular telephone company has two plans. Plan A charges \$11 a month and \$0.12 per minute. Plan B charges \$20 a month and \$0.10 per minute. After how much time, to the nearest minute, will the cost of Plan A be equal to the cost of Plan B? Please help, Thanks! Click here to see answer by nerdybill(7003)

 Question 156304: Given two lines whose equations are 3x+y-8 =0 and -2x+by+9 =0, determine the value of b such that the two lines will be perpendicular. Please help!!!!!!! Click here to see answer by nerdybill(7003)

 Question 156269: I have a chart where I know the value of x. I am able to figure out y in my head, but can't seem to put in equation. x=1,2,3,4,5,6 then y=4,10,18,28,40,54. I need an equation. Thank you Click here to see answer by oscargut(900)

 Question 156321: hello, im a student in calculus and i need help on some of the equation solving problems here are two problems and please tell me the process 1) Find the equation of the line through (-2,5) perpendicular to the x-axis 2) Find the equation of the line through (-2,4) parallel to the y-axis thank you for your time, i have a test tomorrow and i will really appreciate your help please reply back thanks. Click here to see answer by Alan3354(31518)

 Question 153955: Could someone please help me with this problem. write an equation for the following conditions: Passing through (-4,6) perpendicular to the line whose equation is Y= (-1/4)x+5 there are no parentheses around the -1/4 Thank You Deb Click here to see answer by Alan3354(31518)

 Question 156303: A model rocket is launched from ground level. Its height, (h) meters above the ground, is a function of time (t) seconds after launch and is given by the equation h= -4.9t^2 + 68.6t. What would be the maximum height, to the nearest meter, attained by the model? Click here to see answer by ankor@dixie-net.com(15746)

 Question 156307: A box contains one 2-inch rod, one 3-inch rod, one 4-inch rod, and one 5-inch rod. What is the maximum number of different triangles that can be made using these rods as sides? Click here to see answer by Edwin McCravy(8999)

 Question 156484: what is the slope of the line whose equation is 3x-4y-16=0 Click here to see answer by Fombitz(13828)

 Question 156647: Express the following rational expressions in lowest terms y^5-3y^3+8y^2 over 5y Click here to see answer by stanbon(57967)