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

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Question 433035: Could someone please show me how to find an equation of the line containing the given pair points (-2,-7) and (-9,-3) The equation of the line in slope intercept from y__
Click here to see answer by stanbon(57967)

Question 433025: A plane flew 720 miles in 3 hours with a tailwind. It would take 4 hours to travel the same distance with a headwind. Find the speed of the plane in still air and speed of wind.
Click here to see answer by Alan3354(31518)

Question 433133: Suppose you have 12 coins that total 32 cents. Some coins are nickels, while the rest are pennies. How many of each coin do you have?
Please show work and explain!
Thank you :)
Click here to see answer by katealdridge(100)

Question 433210: Factor:
x^2-3xy-18y^2
Click here to see answer by Alan3354(31518)

Question 433026: Systems of Linear Equations: Solve Algebraically
2x+y=5
x^2+y^2=50
Click here to see answer by ankor@dixie-net.com(15746)

Question 434089: solve this equation by substitution
x=8-4y
3x+5y=3
Click here to see answer by mananth(12270)

Question 434087: solve this equation by sustitution
x=8-4y
2x-3y=13
Click here to see answer by mananth(12270)

Question 434099: It took me $60 worth of gas to drive a total of 5 hours what is the equation using y and x

Click here to see answer by nerdybill(7003)

Question 434224: how do i graph negative three less than x plus one less than or equal to five
Click here to see answer by rfer(12730)

Question 434221: Please help me to find the solution set(s) to this problem using Addition Method. Thank you.

Click here to see answer by ankor@dixie-net.com(15746)

Question 434327: How would you solve a problem that looks like this.

3/5 multiplied by "y"= 6
so: 3/5y=6
Click here to see answer by stanbon(57967)

Question 434421: Im sorry but can you help me with the other question

Angelo thinks that x^2=(x-y)^2 for all values of x and y. which pair of values disproves his theory?
A x=2 and y=0
B x=1 and y=1
C x=0 and y=1
D x=0 and y=0
Click here to see answer by edjones(7569)

Question 435008: y=3x
x+y=4500 solve this by elimination
Click here to see answer by stanbon(57967)

Question 435221: The line y=2.25x+1.79 represents an estimate of the average cost of gasoline each year. The line 0.11x-y=-0.85 estimates the price of gasoline in January of each year.
Use the equations of the lines to determine if they are parallel, perpendicular or intersecting. Justify your answer.
Please help me I am completely lost.
Click here to see answer by stanbon(57967)

Question 435232: Could someone please show me how to solve this problem?
Snookers lumber can convert logs into either lumber or plywood. In a given day, the mill turns out three times as many units of plywood as lumber. It makes a profit of $30 on a unit of lumber and $45 on a unit of plywood. How many of each unit must be produced and sold in order to make a profit of $17160
Click here to see answer by stanbon(57967)

Question 435344: What is the answer?
x+3y=-2
Click here to see answer by Alan3354(31518)

Question 435606: I need your help with this question. A farmer has 2420 feet of fence to enclose a rectangular area that borders a river. No fence is needed along the river. Find the possibe dimensions to enclose . I have two equations which are x+x+y=2420 and xy=435600 and I can't figure out where to go from there.
Click here to see answer by edjones(7569)

Question 435904: I think this is the right category...
The average length of time that 3 lawn service mowers operate on a given day is 930 minutes. None of the mowers operates for less than 900 minutes. What is the greatest possible length of time any of the mowers operates?
I am having difficulty figuring out how to set this one up.
930 = [a + b + c] / 3
?
I am returning to algebra after many years of absence. I am now required to pass a test soon. I have other questions as well.
Thank you
mrerek

Click here to see answer by Alan3354(31518)

Question 436218: Could someone please show me how to solve by elimination method?
0.3x - 0.2y = 4
0.2x + 0.54 = 75/17
Click here to see answer by rwm(914)

Question 436331: I need help understanding this problem.
x+3y=15
-8x+3y=-12
So far I have done it 3 times ive got the (3,_) but cant understand how to get 4 using process of elimination
Click here to see answer by stanbon(57967)

Question 436421: How do you find the slope intercept equation of a line through the given point (-5,1) and the slope of -1
Click here to see answer by stanbon(57967)

Question 436651: 16 dived 2 = X plus 1
Click here to see answer by stanbon(57967)

Question 436698: 2x-3y=6
4x+y=1
the question is solve the system of equations i believe this is where i can do elimination or substitution but im kind of confused
thank you in advance
Click here to see answer by scott8148(6628)

Question 436787: Find the zeros of f(x)=x2+x-12. The zeros of f(x) are and
Click here to see answer by robertb(4012)

Question 436865: I know Im in the wrong section, but can anyone help me fill in the blank?!
Velocity of an object, also known as instantaneous velocity, gives a rate of motion and ____________ of an object.
I thought the answer might be time or speed, but unsure. Thank you for your time and assistance!! =]

Click here to see answer by stanbon(57967)

Question 436916: Solve the system:
x^2+y^2=63
x^2-3y^2=27
Click here to see answer by Alan3354(31518)

Question 436988: What is the y-intercept in the equation y=9x?
Click here to see answer by Alan3354(31518)

Question 437164: 5(3y+6)+4(2-y)
Click here to see answer by oberobic(2304)

Question 437190: AFTER SOLVING A SYSTEM OF LINEAR EQUATIONS, HOW CAN YOU CHECK YOUR ANSWER TO DETERMINE WHETHER IT IS CORRECT? please demonstrate the process by checking an answer for a set of equations (that you have created)
THANK YOU !

Click here to see answer by mananth(12270)

Question 437302: I need to figure out how to find solution pairs so that I can turn them into points so I can graph them.
Here is an example: y=-3x
I tried the method substitute 0 for x and solve for y then substitute 0 for y and solve for x.
I don't understand this though
Click here to see answer by richard1234(5390)

Question 437456: Which system has no solution?
A)y=2x+3, y=3x+2
(B) y=4x+3, y=4x-3
(C) y=1/2x, y=1/20x

(D) y is greater than 3, x is less than 2
Click here to see answer by rwm(914)

Question 437769: How do you work this problem: 8a-3-5a=15
Click here to see answer by laurien(6)

Question 437768: How do you work this problem: 10-5x=1x+18
Click here to see answer by laurien(6)

Question 437873: Solve the system of equations then classify the system.
y=-x-11
3x-2y=-18
Click here to see answer by ewatrrr(10682)

Question 438059: determine if any of the ordered pairs are solutions to the equation given: y= -3x (-5,15) (27,-9)

Click here to see answer by solver91311(17077)

Question 438549: For this problem i just need to know the last equation.

A minor league baseball park has 7000 seats. Box seats cost $6,grandstand seats cost $4, and bleachers seats cost $2. When all seats are sold, the revenue is $26400. If the number of box seats is one-third the number of bleachers seats, how many seats of each type are there?

My 2 equations are

x + y + z = 7000
6x + 4y +2z = 26400

What is the last equation?
Click here to see answer by solver91311(17077)

Question 438564: Finding out an equation from a word problem?
Kate borrows $10000. Some is from her friend at %8 annual interest, twice as much as that from her bank at %9 , and the remained from her insurance company at %5. She pays a total of $830 in interest for the first year.

x + y + z = 10000
.08x + .09y +.05z=830

What is the 3rd equation? Im not sure how to se up the twice as much as from her bank?
Click here to see answer by stanbon(57967)

Question 438586: You are trying to decide whether to install a satellite dish or purchase a DVD player and rent DVD's. The satellite is a one time installation of $45. plus $34./month. To purchase the DVD player it is $185 and rent 8 DVD's per month at $2.50 each. At six months the satellite is a better deal and at 12 months the DVD is a better deal. What is the "Break even point"? or At how many months and at what cost will the two options be equal? Explain your answer.
Click here to see answer by jorel1380(2518)

Question 438991: Solve the linear system by using elimination
x+4y=9
-x-2y=3
Click here to see answer by Alan3354(31518)

Question 438991: Solve the linear system by using elimination
x+4y=9
-x-2y=3
Click here to see answer by rwm(914)

Question 439276: the perimeter of a rectangle is 204 inches. The length exceeds the width by 30 inches. What is the length and width?
Click here to see answer by jorel1380(2518)

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