Questions on Algebra: Linear Equations, Graphs, Slope answered by real tutors!

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Question 25539: I need help solving this system of equations by the substitution method:
y=2x-5
4x-y=7
Click here to see answer by askmemath(368)

Question 25588: what is the equation of a line which is slope is -2 and the y-intercept is 3
Click here to see answer by longjonsilver(2297)

Question 25599: There are two questions:
Can you tell me step by step what is 9(5x-2)= 45
The second problem is 10(3x+2)=70

Can you please step by step and the answer
Click here to see answer by longjonsilver(2297)

Question 25525: graph the equation
y-3=2/3(x-6)

Click here to see answer by elima(1433)

Question 25537: I need help on a problem. It is to solve a system of equations by the substitution method. The system is:
x+3y-1
x+2y=9
Click here to see answer by elima(1433)

Question 25645: i assume this is an linear equation.
ok it says find the slope and y intercept of each equation.
y = -2x + 1
how can u find it if its already there?
Click here to see answer by stanbon(57250)

Question 25668: 5y=8
Click here to see answer by stanbon(57250)

Question 25711: what is the y and x intercept of y=3x+2
Click here to see answer by pwac(253)

Question 25716: find the slope of the line that contains a(4,5) and b(-1,-5)
Click here to see answer by pwac(253)

Question 25769: 2(a+4)=3a-1
or help me with Solving Multi-Step Equasions, please

Click here to see answer by Earlsdon(6287)

Question 25713: find 4 solutions for 7x+2y=5
Click here to see answer by elima(1433)

Question 25883: I need to Find the midpoint between these points
(2,3) and (8,1)
Click here to see answer by smoothflyin(6)

Question 25995: you have noticed that your car can travel 420 miles on a tank of gas. your car can hold 17.5 gallons in its tank. write an equation relating the number of miles driven and the numbers of gallons in the tank.

this is what i think it is
420 miles= 1 tank of gas
17.5 gallons=1 tank of gas

i get lost after this

Click here to see answer by Earlsdon(6287)

Question 26046: I'm lost, the problem says "Sketch a line that has the indicated slope. m=3 Help?!!? Please!
Click here to see answer by Ashley1516(4)

Question 26095: The temperature t in Kelvin is 237.15 more than the temperature c in degrees Celcius. Use your function to find the equivalent temperature in Kelvin for 100 degrees celcius.
Click here to see answer by stanbon(57250)

Question 25997: Can you please rewrite the equation y=0.6x-1.45 in standard form integer coefficients( C must also be an integer)
rewrite y=0.6x-1.45 in standard form
Click here to see answer by stanbon(57250)

Question 26195: Please help me solve this equation: .
Click here to see answer by stanbon(57250)

Question 26197: I need help with this question,
Find the equation, in standard form, of the line perpendicular to 3x-6y=9 and passing through (-2,-1) I'm a little confused on the standard form issue.
Click here to see answer by stanbon(57250)

Question 26181: Please help me solve this equation: .
Click here to see answer by ellygirl5969(8)

Question 26180: Please help me solve this equation: .
Click here to see answer by ellygirl5969(8)

Question 26225: 7-3(5t-10)+67
is the answer t=6 or t=2
Do I take -3x5t and -3x-10 or just 3x5t and 3x-10. I always get that mixed up.
Do you have an tips for me in algebra.
Thank you for your help
Click here to see answer by longjonsilver(2297)

Question 26246: please asssit me in solving this problem 8-X-2/2=X/4
i tried but its not the correct answer. this is my working
32-2x-2=x
-2x-x=-32+2
-3x=-30
x=10
correct answer should be 12.

Click here to see answer by mathrebel(25)

Question 26245: .01X-30=16-.06X
Click here to see answer by mathrebel(25)

Question 26356: 2x + 3y=21
4x + 2y =22
Click here to see answer by wuwei96815(245)

Question 26421: A student takes out 2 loans totalling $30000 to pay for college. One loan is at 4% interest, while the other is at 6%. Interest for both loans is compounded annually. Find the amount of the loan at 4% interest if the first year interest on the total loan is $1688.
This is what I have so far:
The sum of the loan is $30000
x + y = 30000
The interst is $1688
4% of x + 6% of y = 1688
(4/100)x + (6/100)y = 1688
y = 30000 - x

Click here to see answer by stanbon(57250)

Question 26454: 1/5x-2=2/3x-2/5x
Click here to see answer by Alwayscheerful(414)

Question 26447: I need help with this equations:
Click here to see answer by Alwayscheerful(414)

Question 25882: I need to solve for x
4x + 3 - 13x - 7 < 2(3-4x)
Click here to see answer by uknouluvme89(30)

Question 25783: 4(-3x+1)=-10(x-4)-14x
Click here to see answer by uknouluvme89(30)

Question 26428: i need help in this problems
find three solutuions of each equation.
1)3x-y=6
2)5x+7y=19

make a table of solutions and graph each equation.
y=x
y=-2x
y=x+1
y=2x+1
y=-3x-1
thank you very much
Click here to see answer by elima(1433)

Question 26473: Please help

Click here to see answer by longjonsilver(2297)

Question 26500: Solve by elimination method I can't seem to get the correct answer. HELP!!!!!!
1. 5x+6y=44
-5x+y=19

2. 9x-y=52
x+8y=22
Click here to see answer by stanbon(57250)

Question 26490: COMPUTE 1/5 - 2/3
Click here to see answer by stanbon(57250)

Question 26541: Solve by elimination Please help I don't understand what to do
1. 7x/2+7y/3=77/3
x/4+y/3=8/3 these are fractions 7x over 2 + 7y over 3 = seventy-seven over three
2. 3 squared x-y=2
6x+y=9
Click here to see answer by stanbon(57250)

Question 26622: Please explain the steps to solve the following problem:
y/4-y+5/3=0
i have changed the bottom numbers into a common denominator of 12 then tried to work through the equation with the following:
36y - 48y +5 = 0
12y + 5 = 0
12y +5 -5 = 0-5
12y= -5
12y/12= -5/12
y= -5/12
can you please explain where I have gone wrong.
Click here to see answer by longjonsilver(2297)

Question 26613: MOM needs HELP...
Solve the system using the method of your choice and tell how many solutions the system has.
x + y = 1
x + y = 3
Click here to see answer by longjonsilver(2297)

Question 26613: MOM needs HELP...
Solve the system using the method of your choice and tell how many solutions the system has.
x + y = 1
x + y = 3
Click here to see answer by venugopalramana(3286)

Question 26581: Hi, I desperately need your help with this linear word problem, I have been working on it for the past few days, it is as follows:

Due to increased sensitivity to the suffering of animals, the number of animals used in laboratory experiments is being reduced. In 1984 about 200 thousand dogs were used in labrotory experiments in the US. Since then, the number of dogs used in laboratory experiments has decreased by about 10 thousand dogs per year. Let d represent the number of dogs (in thousands) used in laboratory experiments in the US at t years since 1984.

I have been trying to figure out the equation that expresses the number of dogs(in thousands) d used in laboratory experiments in terms of the years t since 1984. I need this equation to determine how many dogs were used in laboratory experiments in the year 2003.(I would know how to find the answer to that if I could get to the right equation for the problem.)My instructor told the class that when you see "decreased by about 10 thousand dog PER year", that would be the slope and because it says decreased its negitve. So, this is what I got and i really dont think its right... d = -10 t dont i need a y intercept?
PLEASE HELP! THANK YOU SO VERY MUCH!!

Click here to see answer by longjonsilver(2297)

Question 26730: For what value of 'c' is 'ax - by= c' a direct variation?
Click here to see answer by venugopalramana(3286)

Question 26739: graph and check method to solve the linear system
x=6
y=-2
help- what do I do?
Click here to see answer by longjonsilver(2297)

Question 26755: Please help. I have been trying to make sense if this for days now.
Question : A 50ft long bungee will stretch a certain amount, depending on how much the person doing the jump weight. The following table tells how much a bungee cord will stretch for certain weights. The stretch is in addition to the original 50ft length of the bungee cord.
Weight(lbs) ............................Stretch (ft)
100..........................................80.9
110..........................................86.7
120......................................... 92.4
130..........................................98.1
140..........................................103.7
a) Draw a graph with weight as the independent variable and the stretch as the dependent variable.
b) Write an equation that will predict the stretch distance , d, for a given weight, w
c) If the concrete is 200 ft below the point where the bungee cord is attached , what is the heaviest "safe"weight for a 6ft tall jumper. Assume bungee cord is attached to jumper's ankles.
Click here to see answer by bmauger(101)

Question 26783: i don't understand linear funtions
Click here to see answer by skittle_littles(3)

Question 26847: Help! trying to solve a problem given g(x)=x-3
solve if g[g(6)]
Click here to see answer by venugopalramana(3286)

Question 26864: What's the best way to solve for x:
3x(squared) - x - 7 = 0
Click here to see answer by AnlytcPhil(1276)

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