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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 605318: graph -5x-40y=-30
Click here to see answer by solver91311(16868)

Question 605571: What are the steps to solve this equation:
y = x + 4
3x + y =16

Click here to see answer by solver91311(16868)

Question 605658: Determine whether the ordered pair is a solution of the inequality. (-5,4);2x+y<-3?
Click here to see answer by lawdej(58)

Question 606427: How would you solve a problem like this.
Is this ordered pair a solution of the system of linear equations.
2x+y=3 (0,3)
x-2y=-1
Please show work.

Click here to see answer by richard1234(5390)

Question 606505: solve the elmination method -5x+6y=18
15x-18y=20
Click here to see answer by mananth(12270)

Question 606578: x=w/8+y/8+z/8
solve for y
Click here to see answer by bucky(2189)

Question 606724: For the system of linear equation
-Determine how many solutions exist
-Use either elimination or substitution to find the solutions (if any)
-Graph the two lines, labeling the x-intercepts, y-intercepts, and points of intersection
x + y = 3, y = x + 3
Here is what I have done so far using substitution:
x + y = 3, y = x + 3
x + y = 3
x + y – y = 3 – y
x = 3 – y
3 – y + y = 3 – y
3 = 3 – y
3 – 3 = 3 – 3 – y
y = 0
x + 0 = 3
x = 3
check
x + y = 3
3 + 0 = 3
3 = 3 (It checks here but not in the second equation)
It seems I am getting the reverse of what the answer should be. I have done it many times and I get the same answer. Please help!
Click here to see answer by Alan3354(30983)

Question 606993: i am hoping that you can help me with this linear systems by substitution question y=2x-1
x+5y=28
Click here to see answer by mananth(12270)

Question 606776: 5x-2y=4 Is (-3,8) a solution?
Click here to see answer by asuar010(324)

Question 607098: What is the equation of the line that passes through the point (3, 2) and has a slope of 4
Click here to see answer by nerdybill(6951)

Question 607398: 5x+4y=22
7x+6y=34 Using Matrix Multiplication
Click here to see answer by lynnlo(4155)

Question 607508: 1. Model the following sequence of toothpick figures, Dashes and Stars, with toothpicks and:
a.
Step One: Loop and number each figure and Numerically determine the total number of toothpicks in each figure. Mark your number counts on the figures.
Step Two: Convert your looping ideas into Words.
Step Three: Convert your looping and word ideas into Symbols. Simplify your symbolic equations and check them for n = 1, 2, 3, 4, 5 and 6.
DASHES AND STARS
The figure is: two dashes then a star, dash, star, dash
1 2 3 (numbers underneath figure)
b. How many toothpicks will there be in the 99th Dashes and Stars figure?
c. How many toothpicks will there be in the 100th Dashes and Stars figure?
d. How many toothpicks will there be in the 101st Dashes and Stars figure?
e. For which Dashes and Stars figure are there 84 toothpicks?
f. For which Dashes and Stars figure are there 97 toothpicks?
g. For which Dashes and Stars figure are there 1011 toothpicks?
Please help me with this... Im so confused :(
Click here to see answer by richwmiller(9135)

Question 607507: Model the following sequence of toothpick figures, Rectangles with Pluses, with toothpicks
and:
a.
Step One: Loop and number each figure and Numerically determine the total number of
toothpicks in each figure. Mark your number counts on the figures.
Step Two: Convert your looping ideas into Words.
Step Three: Convert your looping and word ideas into Symbols. Simplify your symbolic
equations and check them for n = 1, 2, 3, 4, 5 and 6.
RECTANGLES WITH PLUSES
fIGURE ONE: I _ _ I fIGURE TWO: I _ _ I_+_I (TWO DASHES ON TOP OF PLUS SIGN TO MAKE TWO SQUARES) fIGURE 3: I _ _ I_+_I__ _I (ALSO TWO DASHES ON TOP OF PLUS SIGN TO MAKE TWO SQAURES)
1 2 3
b. How many toothpicks will there be in the 99th Rectangles with Pluses figure?
c. How many toothpicks will there be in the 100th Rectangles with Pluses figure?
d. How many toothpicks will there be in the 101st Rectangles with Pluses figure?
e. For which Rectangles with Pluses figure are there 124 toothpicks?
f. For which Rectangles with Pluses figure are there 171 toothpicks?
g. For which Rectangles with Pluses figure are there 1009 toothpicks?
Click here to see answer by richwmiller(9135)

Question 607480: What is the answer to solve by the substitution method
7x + 7y = 0
-2x + y = 6
Click here to see answer by richwmiller(9135)

Question 607587: Please solve.
3x = y + 5
x + 2y = 4
My answer is y=1, x=2 (apparently I solve differently than my son's teacher)

Click here to see answer by rfer(12647)

Question 607587: Please solve.
3x = y + 5
x + 2y = 4
My answer is y=1, x=2 (apparently I solve differently than my son's teacher)

Click here to see answer by solver91311(16868)

Question 607695: solve using the substitution method 2x+9y=5 x=4-6y
Click here to see answer by Alan3354(30983)

Question 607840: Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this.
6x – 4y = 19
24x - 16y = -76

Click here to see answer by Alan3354(30983)

Question 607867: Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this.
6x – 4y = 19
24x - 16y = -76
Click here to see answer by jim_thompson5910(28504)

Question 607875: 7-7/8x greater than or equal to 8
Click here to see answer by lynnlo(4155)

Question 607987: A van starts off with a full tank of gas (13 gallons). The van consumes 1 gallon of gas for every 25 miles it drives. Write a linear equation relating the number of gallons g left in the gas tank as a function of the number of miles m the van has driven.
Click here to see answer by ewatrrr(10682)

Question 608019: y = 1/2x + 1
2y - x = 6
How many solutions does this system have?(:
-none, one, or ifinite?
Click here to see answer by josmiceli(9661)

Question 608022: y = x + 1
2y - x = 6
The lines whose equations are shown intersect at which point?

- (0, -2s)
- (-2s, 0)
- (4s, 2s)
Please Help!(:
-Kate(:
Click here to see answer by ewatrrr(10682)

Question 608133: A chemist needs 140 milliliters of a 33% solution but has only 11% AND 395 solutions available. Find how many milliliters of each that should be mixed to get the desired solution.
Click here to see answer by Alan3354(30983)

Question 608284: Find the x-intercept and y-intercept of 7x+2y=13
Click here to see answer by stanbon(57246)

Question 608284: Find the x-intercept and y-intercept of 7x+2y=13
Click here to see answer by solver91311(16868)

Question 608474: use subtraction method to solve: x+y=3 and 7x-y=29
Click here to see answer by lynnlo(4155)

Question 608523: How many solutions does this system have?
–3x + 6y = 10
–3x + 6y = –4
Click here to see answer by flame8855(424)

Question 608523: How many solutions does this system have?
–3x + 6y = 10
–3x + 6y = –4
Click here to see answer by ewatrrr(10682)

Question 608540: what is the slope between the two points (2, 3)and (1, 4)?

Click here to see answer by lynnlo(4155)

Question 608512: what isthe equation of the vertical line that passes through the point (-2, -1).

what is the equation of the horizontal line that passes through the point (2, 4).

what is the equation that represents the line that passes through the point (-2, -1) and has a slope of 5.

what is the equation of the line that passes through the point (6, 4) and is parallel to y = 1/3x - 3.
Thank you for your help!
Click here to see answer by ewatrrr(10682)

Question 608727: Solve the inequality.
6y – 8 ≤ 10

Click here to see answer by deborabr(181)

Question 608973: You have to graph the linear system. then use the graph to tell whether the linear system has one solution, no solution, or infinitely many solutions. the question is -9x+6y=18 and 6x-4y=-12. This is just one problem.
Click here to see answer by lynnlo(4155)

Question 609043: Because of this Algebra, I keep receiving bad marks on my report cards and progress reports.
I had five problems that I had to do on graph paper. I did four of them, but didn't understand the rest.
15. x+2y<10, x+2y>9 (Two equations per problem. There's a little line under the equal to signs.)
16. (Again, there's a little line underneath the equal to sign.) y>-x+5, y<3x-4
My Algebra teacher just isn't too elaborate with things and doesn't really help me. If you could just explain steps to graphing these equations, my gratitude would go through the roof.
Thank you. :)
-Marissa
Click here to see answer by flame8855(424)

Question 609059: Question 3:
write the equation y = -1/7 x - 3 in standard form.
Thank you! :)
Click here to see answer by ewatrrr(10682)

Question 609119: 2x+y=7
x+3y=1
Click here to see answer by flame8855(424)

Question 609153: -2x+2y=2
-4y-2x=-22
Solve the system of equations
Click here to see answer by ewatrrr(10682)

Question 609366: I need help figuring out how to do three y squared plus five y equals twelve? I am really confused and all your help will be appreciated!
Click here to see answer by flame8855(424)

Question 609547: How do you slove the non linear system algebraically.
y=x^2+3x-5
y=2x+1
Click here to see answer by solver91311(16868)

Question 610034: Can you give me step by step how to solve Linear Equations and why you did what you did? Please do equations like -4(3r-2)=-4 and 3(h-9)+2h=3
Click here to see answer by stanbon(57246)

Question 610133: Solving for...
4x-3y = 10
x+4y = 7
Using any methood...
Solution: x = 3.21052631578947, y = 0.947368421052632
However (1, -2) also works why?
How can I solve this system and yeild the possible result (1, -2)?

Click here to see answer by ewatrrr(10682)

Question 610070: Find an equation of the line L that passes through the point
(−2, 4)
and satisfies the given condition. (Let x be the independent variable and y be the dependent variable.)
L is perpendicular to the line
2x + 5y = 10
Click here to see answer by flame8855(424)

Question 610210: How do I graph y=4
Click here to see answer by jim_thompson5910(28504)

Question 610230: I need to find out how many miles (m) it will be until the price is the same.
y = $.10m + $24,500
y = $.12m + $22,000
Click here to see answer by Alan3354(30983)

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