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

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Question 586168: What is the first line of the equation for:
-3x+2y=-6
-2x+y=6
The answer is (-18,-30) I just don't know how to write out the problem.
Click here to see answer by rfer(12678)

Question 586337: i am 600 miles away from home traveling at 65 mph and i need an equation to find out when ill be 300 miles away from home. is y=65x+600 a good equation?

Click here to see answer by Alan3354(30993)

Question 586442: what is 4(x+7)=7+x??
Click here to see answer by josmiceli(9697)

Question 586625: How do I find out if 2x-9y=23 is linear
Click here to see answer by solver91311(16897)

Question 586639: two positive integers are in the ratio 2 to 5 if both numbers are decrease by 5 the new ratio is 1:4 find the original numbers.
Click here to see answer by solver91311(16897)

Question 586667: 1: twice the numerator of a fraction exceeds the denominator by 2. if 1 is added to both the numerator and the denominator, the resulting fraction is equal to 2/3. find the orginal fraction
Click here to see answer by ankor@dixie-net.com(15667)

Question 586938: I need to find the ordered pair of the x intercept. the problem is;
y=x^2-2x-3
Click here to see answer by richwmiller(9143)

Question 587193: The point (3, 2) lies on the line 11x – 6y = 21. Determine if this point is a solution of the system
11x – 6y = 21
9x + 8y = 43

Click here to see answer by josmiceli(9697)

Question 587803: 9x = 7x + 10
Click here to see answer by Alan3354(30993)

Question 587895: How do I work the equation:
What is the slope of the line whose equation is y=2x+7?
I am confused as to how I work the process step by step.
Thanking you for your assistance.
Click here to see answer by mananth(12270)

Question 588053: Use row of operations to solve x+y+z=-5, x-y+3z=-1, 4x+y+z=-2

Click here to see answer by Edwin McCravy(8921)

Question 588068: 15y+5/-21y-7
The slash is the fraction line. In the textbook it looks like this:
15y+5
------
-21y-7
Click here to see answer by Edwin McCravy(8921)

Question 588103: I am trying to write and solve a system of equation. THe question is 3 large popcorns and 2 small drinks cost $21.00 and another customer bought 2 large popcorns and 4 small drinks for $22.00. Find the cost of a large popcorn and the cost of a small drink.
Click here to see answer by stanbon(57422)

Question 588391: What is the solution of the following system of equations?

The choices are:
1. (0,-4)
2. (-4,0)
3. (-4,-3) and (0,5)
4. (-3,-4) and (5,0)
I saw that these equations both equal y so I set them equal to eachother. But then I got lost after putting them together. I don't know what I am finding.
Thanks!
Click here to see answer by oscargut(891)

Question 588781: x+y=-7
3x+y=-9
Click here to see answer by littlealice(2)

Question 588967: what is the x and y intercept for x-y=-3
Click here to see answer by jim_thompson5910(28598)

Question 589242: i need to know how many solutions the system has.
x^2+y^2=4 and y=x-1
Click here to see answer by richwmiller(9143)

Question 589483: i am doing solving systems by elimination and i don't understand how to the problem. it is 3x-y=-2 and -2x+2y=8
Click here to see answer by richwmiller(9143)

Question 589501: in math im doing solving systems by elimination and one of the problems have three equations in the system. does that change the process you use or is it the same just with three equation?
Click here to see answer by richwmiller(9143)

Question 589783: Suppose that f is a linear function with slope 2.4 and that f(7)=-3. What value of x gives f(x)=0? Thanks!
Click here to see answer by John10(245)

Question 589896: every boy had 5 hotdogs and 3 sodas. every girl had 3 hotdogs and 2 sodas. together, the children ate 74 hotdogs and 46 sodas. how many children were there?
Click here to see answer by stanbon(57422)

Question 589956: suppose a sports club has a membership fee of $300 in addition to a $40 monthly fee while a gym has a membership fee of 400 but has a monthly fee of only $30.
WRITE A SYSTEM OF LINEAR EQUATIONS REPRESENTING THE COST OF THE CLUB AND THE GYM AS A FUNCTION OF THE NUMBER OF MONTHS OF USE.
SOLVE THE SYSTEM YOU WROTE . WHAT DOES THIS SOLUTION MEAN ?

Click here to see answer by solver91311(16897)

Question 590202: Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this.
3x + 7y = 77
-2x + 7y = 42
Click here to see answer by josmiceli(9697)

Question 590190: A boat takes 3 hours to go 42 miles downstream with the current. It takes 4.2 hours to go 42 miles upstream against the current. What is the speed of the current? What is the speed of the boat?
Click here to see answer by lwsshak3(6527)

Question 590200: A farmer mixes a 20% fertilizer solution with a 40% fertilizer solution to make 8 quarts of a 33.75% fertilizer solution. How many quarts of each does she use?
Click here to see answer by lwsshak3(6527)

Question 590196: In 6 years, Sylvia will be 6/5 Hue's age. Four years ago, Sylvia was 10 years less than twice Hue's age. How old are Sylvia and Hue now?
Click here to see answer by lwsshak3(6527)

Question 590352: How do I solve 2x+3y=18 and x=2y-5 its one problem and I want to use the substitution method.thanks
Click here to see answer by scott8148(6628)

Question 590352: How do I solve 2x+3y=18 and x=2y-5 its one problem and I want to use the substitution method.thanks
Click here to see answer by Theo(3472)

Question 590549: What is the solution of this linear system? 3x+5y=-1; 2x-5y=16
Click here to see answer by Alan3354(30993)

Question 590799: Use the substitution method to solve the system of equations.
2x - 5y = -14
x - 2y = -5
Click here to see answer by rfer(12678)

Question 590850: You are back on the HOA board. The time has come to buy more trees and bushes for the neighborhood park. The first order was for 24 bushes and 16 trees and the bill totaled $3960. The second order was 12 bushes and 32 trees and the bill totaled $5220.
Write an equation illustrating the first bill using b for the cost of the bushes and t for the cost of the trees.

Click here to see answer by richwmiller(9143)

Question 590954: Solve each system graphically. Be sure to check your solution. If a system has an infinite number of solutions, use set−builder notation to write the solution set. If a system has no solution, state this. a=1+b b=5-29
Click here to see answer by richwmiller(9143)

Question 591044: Please help me solve this system and graph 6u+v=32, 6u=v+40
Click here to see answer by Alan3354(30993)

Question 591130: 2x + y = 8 y= x - 7
Click here to see answer by mananth(12270)

Question 591131: 2x-y =6 x + y = -3
Click here to see answer by mananth(12270)

Question 591128: 2x + 3y = 0 x+ 2y = -1
Click here to see answer by mananth(12270)

Question 591322: need help to solve this please
3x+4y=5,
2x+y=1
Click here to see answer by jim_thompson5910(28598)

Question 591363: Hi! I am having problems with this problem:
it says find the equation of the line which satisfies each set of conditions:
- passes through the point with coordinates (-2,1) and is parallel to the line, 3y-x=9.
this is what I have got so far
3y-x=9
3y(o)=9
3y=9
3y/3=9/3
y=3 (0,3)
3(0)-x=9
x=9 (9,0)
I dont know if it is correct and what to do next, can anybody help me please?
Click here to see answer by scott8148(6628)

Question 591405: Hi! I am having some issues with this equation, I usually can solve the ones that are not fractions, fractions are hard for me :( thank you
x/2-6=3+x/5
Click here to see answer by scott8148(6628)

Question 591484: Hi I would like some help with this equation, I get confused because of the double d.I have tried opposite in each side but I don't think is right.I appreciate it.
6d+7=5d-2
Click here to see answer by rfer(12678)

Question 591614: If I walk 50kms. The first day I walk so far the next day I walk half as much and on the 3rd day I walk a third of the day before and on the fourth day a fourth of the day previously, How far did I walk the first day
Click here to see answer by Theo(3472)

Question 591658: Find the determinant of this 3x3 matrix using expansion by minors about the second row
0 -4 6
A= 5 0 0
9 -2 7
Click here to see answer by Alan3354(30993)

Question 591808: Find linear equation below, rewrite into y=mX+b
-3x+2y=2
Click here to see answer by mukhi1(5)

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