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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 1071837: monthly charge for garbage collection is $12 for 42lbs and $16.80 for 50lbs, derive a a linear cost function
Click here to see answer by stanbon(75887)

Question 1071877: { y=3x x+2y=-21. Sovle the system by by substitution. Enter your answer as an ordered pair, or type none or infinite.
Click here to see answer by Boreal(15235)

Question 1071877: { y=3x x+2y=-21. Sovle the system by by substitution. Enter your answer as an ordered pair, or type none or infinite.
Click here to see answer by MathTherapy(10552)

Question 1072130: The system of equations has how many solutions? y=-3/2x+5 and y=-3/2x-3
a)0
b)2
c)1
d)infinitely many
Click here to see answer by ikleyn(52788)

Question 1072173: 1 1/3 - 6 7/12 divided by (-5) =
I came up with 12.6
Is that correct?
Click here to see answer by Fombitz(32388)

Question 1072152: A $70,000 trust is to be invested in bonds paying 9%, CDs paying 7%, and mortgages paying 10%. The bond and CD investment together must equal the mortgage investment. To earn a $6430 annual income from the investments, how much should the bank invest in bonds?
Click here to see answer by ankor@dixie-net.com(22740)

Question 1072126: 4x.2^X^2=16^2

Click here to see answer by Alan3354(69443)

Question 1072302: Is there anyone that can help? I don't understand how to do this. Solve the following system of line at equation by substitution and determine whether the system has one solution, no solution or an infinite number. If the system has one solution, find solution.
-2x-y=23
7x-2y=2
Click here to see answer by rothauserc(4718)

Question 1072330: f(x)=2.5x-10.5 substitute 2 for x
Click here to see answer by stanbon(75887)

Question 1072087: a catering company is settling up tables for a big event that will host 784 people. when they set up the tables they need two forks for each child and five forks for each adult. if the company ordered a total of 2992 forks how many adults and children will be attending the event?
Click here to see answer by jorel1380(3719)

Question 1072575: X+5y=-10
X+5y=5
Solve the linear system by graphing
Click here to see answer by stanbon(75887)

Question 1072731: A vegetable stand sells pumpkins for $5 each and squashes for $3 each . One day they sell 6 more squashes than pumpkins and their total was $98. Write a system of equations and solve to find how many pumpkins and squashes they sold.
Click here to see answer by josgarithmetic(39618)

Question 1072831: Please help me understand this problem,The length of a rectangular court of badminton is 27 feet longer than its width. If its perimeter is 122 feet. What are the dimensions of the rectangular court? Thank you :)
Click here to see answer by ikleyn(52788)

Question 1072839: For what value(s) of k are the two planes parallel? ( 4x+ 6y−4z=0
−kx + 15y + kz = 2

Click here to see answer by Fombitz(32388)

Question 1072949:
Click here to see answer by Fombitz(32388)

Question 1072998: Write the system below in the form Ax = b, where A is a 3x3 matrix of
coefficients, x is a 3x1 vector of variables and b is a 3x1 vector of constant terms.
y − 2x − 1 + 6z = 0
2z + 4x = 18
6z + x = y + 5z + 3

Click here to see answer by Fombitz(32388)

Question 1073177: 5x-3y=2
6x+7y=13
plot each question on fully labeled graph
use the graph to find the coordinates:
1. of their points of intersection with the x and y
2. where the two lines intersect
Click here to see answer by Alan3354(69443)

Question 1073230: (5,2) (1,10)
Click here to see answer by josgarithmetic(39618)

Question 1073361: Calculate the term independent of x in the binomial expansion of (x-1/2x^5)^18

Click here to see answer by KMST(5328)

Question 1073361: Calculate the term independent of x in the binomial expansion of (x-1/2x^5)^18

Click here to see answer by MathTherapy(10552)

Question 1073441: wahab and his son kashif are selling cookies.They have 20q cookies on sale for 2p dollars each. If they received r dollars from each cookie sales, how many ccokis were not sold ?
Click here to see answer by josmiceli(19441)

Question 1073464: whats the slope intercept form for
slope: -5/3
y intercept: -2

Click here to see answer by math_helper(2461)

Question 1073598: A company manufactures both liquid crystal display (LCD) and cathode ray tube (CRT) color monitors. The cost of materials for a CRT monitor is $30, whereas the cost of materials for an LCD monitor is $130. The cost of labor to manufacture a CRT monitor is $60, whereas the cost of labor to manufacture an LCD monitor is $130. During a week when the company has budgeted $10330 for materials and $11560 for labor, how many LCD monitors does the company plan to manufacture?
Click here to see answer by ikleyn(52788)

Question 1073597: A turbo-prop plane flying with the wind flew 2100 mi in 5 h. Flying against the wind, the plane required 7 h to travel the same distance. Find the rate of the wind and the rate of the plane in calm air.
Click here to see answer by ikleyn(52788)

Question 1073599: A contractor buys 15 yd^2 of nylon carpet and 26 yd^2 of wool carpet for $1085. A second purchase, at the same prices, includes 10 yd^2 of nylon carpet and 20 yd^2 of wool carpet for $790. Find the cost per square yard of the wool carpet
Click here to see answer by stanbon(75887)

Question 1073596: A chemist has two alloys, one of which is 15% gold and 10% lead and the other which is 20% gold and 30% lead. How many grams of each of the two alloys should be used to make an alloy that contains 82.5 g of gold and 65 g of lead?
g (first alloy)
g (second alloy)
Click here to see answer by ptaylor(2198)

Question 1073739: 3x+4y=-4
x-2y=2
Determine whether the system has no solution, infinite or one solution.
CAN SOMEONE PLEASE SHOW ME HOW TO DO THIS?? THANKS!!
Click here to see answer by htmentor(1343)

Question 1073757: Two angles are complementary. (Complementary angles are two angles whose sum is 90�.) The larger angle is 5� more than sixteen times the measure of the smaller angle. Find the measure of the two angles.
� (smaller angle)=?
� (larger angle) = ?
Click here to see answer by Fombitz(32388)

Question 1073758: A pharmacist has two vitamin-supplement powders. The first powder is 15% vitamin B1 and 15% vitamin B2. The second is 5% vitamin B1 and 15% vitamin B2. How many milligrams of each of the two powders should the pharmacist use to make a mixture that contains 59 mg of vitamin B1 and 69 mg of vitamin B2?
Click here to see answer by josgarithmetic(39618)

Question 1073747: 4y=-4x+8
2y=-8x-8
find if these have no solution, infinite or one solution.
Would you divide the first by 4y and the other one by 2y?? Is it no solution?? Can someone show me how to work it out? Thank you
Click here to see answer by Fombitz(32388)

Question 1073749: solve simultaneously
2y-3x=-21
2x+3y=-1

Click here to see answer by Fombitz(32388)

Question 1073756: A jet plane flying with the wind went 1780 mi in 4 h. Against the wind, the plane could only fly 1520 mi in the same amount of time.
Find the rate of the plane in calm air and the rate of the wind.
plane speed
mph = ?
wind speed
mph = ?
Click here to see answer by ikleyn(52788)

Question 1073786: You are saving dimes and quarters in your piggy bank. You have 42 coins that have a total value of $6.75. How many dimes and quarters do you have in your piggy bank?
Click here to see answer by addingup(3677)

Question 1073788: Given that
5a - 7b + 3c = 19,
2a - 4b + c = 77,
determine the value of a+b+c. Thank you.
Click here to see answer by Edwin McCravy(20056)

Question 1073788: Given that
5a - 7b + 3c = 19,
2a - 4b + c = 77,
determine the value of a+b+c. Thank you.
Click here to see answer by ikleyn(52788)

Question 1073829: The length of a rectangle is 3 inches longer than its width. If the perimeter of the rectangle is 26 inches, find its area.
Click here to see answer by josgarithmetic(39618)

Question 1073837: The length of a rectangle is four times it's width. If the perimeter of the rectangle is 60 ft, find its area.
Click here to see answer by josgarithmetic(39618)

Question 1073826: -5x-3y+6z=-26
X+2y-2z=8
5x-4y+3z=12
Click here to see answer by sachi(548)

Question 1073909: Find the point at which the line ⟨−5,−5,−2⟩+t⟨5,3,−2⟩ intersects the plane 5x+3y+2z=16
Click here to see answer by Fombitz(32388)

Question 1073971: What does x equal in 2(x+2)=3x+(-15)?
Click here to see answer by josgarithmetic(39618)

Question 1074037: Find the equation for the line that passes through the point (-2,4) abd that is parallel to the line with the equation y-3=1/2 (x-2)
Can someone please show me the steps
Click here to see answer by addingup(3677)

Question 1074045: 1/2x+y=4
6x+3y=5
How do you work these to determine if they a parallel, perpendicular or neither?
I need help please
Click here to see answer by Fombitz(32388)

Question 1074031: -x+y=3
4x+4y=9
Find if these are parallel, perpendicular or neither.
Is this neither and is this where you substitute 0 for x and y?
Can someone show me the steps so I can understand? Thanks 😊
Click here to see answer by KMST(5328)

Question 1074462: Please help me this question
y=13-4x
3x+2y=16
What is substitution
Click here to see answer by addingup(3677)

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