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

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Question 613778: Find the slope of each line
through (-2,3) & (5,-6)
i think i subtract the y & x1's to the y & x2's but dont know where to go from there.. help please
Click here to see answer by jim_thompson5910(35256)

Question 613769: find the intercepts for the equation
3x+y=-7
x-intercept:
y-intercept:
Click here to see answer by stanbon(75887)

Question 613788: "Find the slope of each line"
6x-2y=5
i dont know if i was supposed to plug in the zero even though there already is a number. help?
Click here to see answer by scott8148(6628)

Question 613791: determine weather the two lines are parallel perpendicular or neither
2x+2y=7
2x-2y+5
Click here to see answer by scott8148(6628)

Question 613841: If there is no solution or infinitely many solutions, state so. Put the value for x in the blank:
2x + 3y = 9; 11x + 7y = 2
To solve for x, I keep getting 4 but I am thinking this is not correct.
Can you help?
Click here to see answer by scott8148(6628)

Question 614217: Elimination
4x-6y=3
6x-4y=-3
Click here to see answer by stanbon(75887)

Question 614218: Elimination
8s+12t=16
6s+9t=12
solve
Click here to see answer by richwmiller(17219)

Question 614383: A company produces a product which it sells for $55 per unit.each unit cost the firm $23 in variable expenses,and fixed costs on an annual basis are $400,000.
if x equals the number of units produced and sold during the year:
(a) formulate the linear total cost function.
(b)formulate the linear total revenue function.
(c)formulate the linear profit function.

Click here to see answer by bucky(2189)

Question 614468: Does the following have a question have unique solution? Why?

[ 4x - 6y = -7
-2x + 3y =18
Click here to see answer by Alan3354(69443)

Question 614461: find th y intercept
4x-y=0
Click here to see answer by Alan3354(69443)

Question 614452: 10.) "find the slope of the line through each pair of points"
(3, -1) & (2,1)

i tried doing y2-y1/x2-x1 formula but I'm not sure if the answer is -2 / 1
Click here to see answer by richwmiller(17219)

Question 614544: 2x � 5y = -1
x � 3y = -3

Click here to see answer by sophxmai(62)

Question 614619: (-3, ___) is a solution of y = 4 - 3x
Now what I have tried is:
y = 4 - 3(-3)
y = 4 - -9
y = -5
So then I
y = 4 - 3(5)
y = 4 - 15
y = 9
I can't figure out this problem and I still don't understand how to come up with the two numbers needed
Click here to see answer by stanbon(75887)

Question 614903: Given info: y= 2x+1 y=2x-1
Is there a common solution for this problem?
Click here to see answer by Alan3354(69443)

Question 614288: Using the equation: 2x - y = 4
What is the x-intercept, y-intercept, and slope of this line?

Click here to see answer by asuar010(338)

Question 614404: what is the equation that is parallel to 3x-2y=4 and passes through the origin?
Click here to see answer by asuar010(338)

Question 615318: can you please help me with this
solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions state this.
11x+8y=103
22x-7y=68
Click here to see answer by Alan3354(69443)

Question 614552: Can someone please help me with the

2x � 5y = -1
x � 3y = -3

Click here to see answer by asuar010(338)

Question 615595: how to solve y+4=x^2+x algebraically?
Click here to see answer by stanbon(75887)

Question 615646: 7x+6+x>5x+10 write solution set in interval notation and graph
Click here to see answer by jim_thompson5910(35256)

Question 615986: we are working on systems of linear equations in two variables.
Solve ( I have no idea):
10x-2y=4
3x-6y=12
Click here to see answer by JBarnum(2146)

Question 616149: x+y=4
x-y=8
which of the 3 methods (graphing, substitution, or elimination) would you use to solve this linear system,
Click here to see answer by Alan3354(69443)

Question 616198: I'm sorry if this question is in the wrong place,
Solve:
(y+1)^2=1
(y-3)^2
in word form- Y plus 1 to the 2nd power over y minus 3 to the second power equals 1

Click here to see answer by solver91311(24713)

Question 616543: slove (2x+7)^2
Click here to see answer by lynnlo(4176)

Question 616568: Solve this system of equations using substitution. Put your answer in ordered pair form (x,y). 8x - y=4 5x 3y=17
Click here to see answer by ladyluck4772(11)

Question 616985: on a feasible region whose vertices ar{(0, 0), (1, 12), (5, 8), (8, 3), (9, 0) what is the maximum of the objective function p=6x+4y, and where does it occur?
Click here to see answer by solver91311(24713)

Question 617056: What is the value of x in the solutions to following equations
x - y + -3
x + 3y =5
Click here to see answer by ewatrrr(24785)

Question 616306: x+y=7 and 2x-y=2 then y=?
2x+y=4 and 3x-2y=13 then x=?

Click here to see answer by ewatrrr(24785)

Question 617155: how do you find out if these two lines are parallel,perpendicular or neither
y= 3/8x -4
8x + 3y=10
Click here to see answer by scott8148(6628)

Question 617417: 3x+y=0
6x+y=3
then graph
Click here to see answer by Alan3354(69443)

Question 617418: a tugboat goes 180 miles upstream in 10 hours. the return trip downstream takes 5 hours. find the speed of the tugboat without a current and the speed of the current.
Click here to see answer by scott8148(6628)

Question 617528: 5x+8y=59
6x-8y=-70
solve by the elimination method.
how do I solve this

Click here to see answer by lynnlo(4176)

Question 617580: 5x3+5y+3x-3y+2y
Click here to see answer by jim_thompson5910(35256)

Question 617760: How do I solve 3x + y = -8
2x -y = -8 by graphing?
Click here to see answer by Alan3354(69443)

Question 617760: How do I solve 3x + y = -8
2x -y = -8 by graphing?
Click here to see answer by KMST(5328)

Question 617988: solve the following system of equations using substitution.
-2x-10y=-12
3x+y=4
Click here to see answer by mananth(16946)

Question 618004: Use the method of substitution to solve the system of linear equations :
4x-y=5
9x-2y=14
Click here to see answer by richwmiller(17219)

Question 618099: Having trouble. Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this.
4x � 5y = -7
-8x + 10y = 14
Click here to see answer by Alan3354(69443)

Question 618098: Having trouble. Solve using the substitution method. Show your work. If the system has no solution or an infinite number of solutions, state this.
4x + 4y = -36
4x + 4y = 12
Click here to see answer by Alan3354(69443)

Question 618025: A tugboat goes 120 miles upstream in 20 hrs. the return trip downstream takes 5 hrs. find the speed of the tugboat without a current and the speed of the current
The speed of the tugboat is
The speed of the current is
simplify your answers
Click here to see answer by ankor@dixie-net.com(22740)

Question 618396: How can you tell if an ordered pair is the solution to a linear equation with two variables. Show the process of "checking" to see if an ordered pair is a solution to a linear equation with two variables. Write another linear equation with the variables x and y and provide an ordered pair for your classmates to "check".
Click here to see answer by solver91311(24713)

Question 618450: Traffic signs are regulated by the Manual on Uniform Traffic Control Devices (MUTCD). The premiter of some traffic sign msut be 116 inches. Also, its lenght is 10 inches longer than its width. Find the dimensions of this sign. Please help me solve to obtain the width of the sign is ____ inches and the lenght of the sign is _____ inches.
Click here to see answer by stanbon(75887)

Question 618446: What is the ordered pair using the method of substitution to solve the system of liner equations x-y=3 5x-5y=15
Click here to see answer by richwmiller(17219)

Question 618447: Using the method of substitution to solve the system of linear equations, what is the ordered pair for x-7y=6 4x-28y=-15
Click here to see answer by IFY(62)

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