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

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 Linear Solvers Practice Answers archive Word Problems Lessons In depth

 Question 123709: I am supposed to solve the following linear system using linear combinations. Please help me to solve this problem. I have done the following work to the problem so far: 5e + 4f = 9 *The two equations on the left are the original linear system. 4e + 5f = 9 20e + 16f = 36 + (-20e)- 25f = -36 ________________ -9f= 0 f=0 5e+4*0= 9 5e+0= 9 e=1.8 However, when I substituted these two solutions to the variables e and f, the second equation-----> 4e + 5f = 9----- was not true. Please help me to achieve the correct answer. Much appreciated, Megan B. Click here to see answer by Fombitz(13828)

 Question 123848: from work book; A construction company charges \$15 per hour for debris removal, plus a one-time fee for the use of a trash dumpster. The total fee for nine hours of service is \$195. Write the point-slope form of an equation to find the total fee y for any number of hours x. Click here to see answer by solver91311(16868)

 Question 123845: I do not get how to use the substitution method while solving the equation 2x+4y=-6 x-3y=7 Click here to see answer by chitra(359)

 Question 123854: i need help on systems of equations with 3 variables. 2x+y-3z=-12 5x-y+z=11 x+3y-2z=-13 Please and Thank you! Click here to see answer by johnnico6426(16)

 Question 123961: 2. There were 1500 people at a high school football game. Student tickets were \$2.00 and adult tickets were \$3.50. The total receipts for the game were \$3825. How many students bought tickets? Let a = the number of adult tickets purchased. Let s = the number of student tickets purchased. a. Write a system of equations that can be used to determine the number of adult and student tickets purchased. b. Determine the number of adults tickets sold and the number of student tickets sold. Use mathematics to explain how you determined your answer. Click here to see answer by checkley71(8403)

 Question 124011: Do the points in each set lie on the same line? Explain your awnser. P(4,2),Q(-3,2),R(2,5) Click here to see answer by checkley71(8403)

 Question 124028: at what point would the lines 5x+y=19 and -x=2y=-6 intersect i tried and i'm not sure if it was (4,-1) Click here to see answer by checkley71(8403)

 Question 124027: how many solutions do this linear system have? 2x-6y=-14,-2x+3y=7 Click here to see answer by checkley71(8403)

 Question 124032: at what point do the lines 5x+y=19 and -x+2y=-6 intersect I tried and got the answer (4,-1) Click here to see answer by checkley71(8403)

 Question 124031: SOLVE BY SUBSTITUTION METHOD AND DETERMINE WHETHER ITS A INDEPENDENT, DEPENDENT, OR INCONSISTENT x=2y-7 3x+2y=-5 Click here to see answer by solver91311(16868)

 Question 124036: what is the soulution for x in this system of equations x+y=6 and 2x-y=9 i got negative five and wasnt sure it was correct Click here to see answer by ankor@dixie-net.com(15624)

 Question 124091: Suppose you have 3 nickels, 2 dimes, and 6 quarters in your pocket. If you draw a coin randomly from your pocket, what is the probability that a. You will draw a dime? b. You will draw a half-dollar? c. You will draw a quarter? Click here to see answer by stanbon(57219)

 Question 124092: what is the solution to y=-2x+4 and y=1x+2 Click here to see answer by chitra(359)

 Question 124224: Which is the slope of Ax+By=C? -B/A C/A -A/B C/B Click here to see answer by ankor@dixie-net.com(15624)

 Question 124545: Write the equation of the line with slope 4/3 and y-intercept (0, 3) in slope-intercept form (y = mx + b). Click here to see answer by iluvbuilding429(41)

 Question 124544: Write the equation of the line through (-2, 3) and parallel to y = 2x - 4 in slope-intercept form (y = mx + b). Click here to see answer by anne(47)

 Question 124593: What line goes through (-9, 0) that has a slope of 3/5? Write your answer in standard form Ax + By = C. Click here to see answer by checkley71(8403)

 Question 124590: Write the equation of the line through (2, 3) and perpendicular to y = -2x + 4 in slope-intercept form (y = mx + b). Click here to see answer by anne(47)

 Question 124595: Identify the ordered pair(s) so that it (they) is (are) not a solution(s) for 7x + 2y = 17: (0, 2/17) (1, 17/7) (0.5, 27/4) (-2, 31/2) Click here to see answer by checkley71(8403)

 Question 124659: Given f(x) = x2 + 5x + 2, find f(0). Click here to see answer by jim_thompson5910(28476)

 Question 124655: Solve the system by addition. 4x – 5y = –19 x + 3y = 8 Click here to see answer by jim_thompson5910(28476)

 Question 124654: Solve the system by substitution. x + 5y = 11 –3x – 2y = –7 Click here to see answer by jim_thompson5910(28476)

 Question 124657: The sum of two numbers is 38. Their difference is 10. What are the two numbers? Click here to see answer by jim_thompson5910(28476)

 Question 124656: The sum of two numbers is 38. Their difference is 10. What are the two numbers? Click here to see answer by gems(12)

 Question 124658: Rewrite the equation –3x + 9y = –90 as a function of x. Click here to see answer by MathLover1(6614)

 Question 124713: The sum of two numbers is 52. Twice the first number is 17 more than the second. Find the numbers. I just need to know how to set this up. Click here to see answer by jim_thompson5910(28476)

 Question 124732: After robbing a bank in Dodge City, a robber gallops off at 13 mi/h. 20 minutes later, the marshall leaves to pursue the robber at 16 mi/h. how long (in hours) does it take the marshall to catch up to the robber? Click here to see answer by checkley71(8403)

 Question 124770: Write the equation in either slope-intercept form or standard form: The vertical line through the point(-45,61) Click here to see answer by solver91311(16868)

 Question 124769: Write the equation in either slope-intercept form or standard form: The line through the points (0,12) and (5,8) Click here to see answer by iluvbuilding429(41)

 Question 124768: Write the equation in either slope-intercept form or standard form: The line with the slope m=5, passing through the point (-12,0) Click here to see answer by iluvbuilding429(41)