Questions on Algebra: Graphs, graphing equations and inequalities answered by real tutors!

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Question 180723: please help me solve this problem
If the sum of a number and 9 is decreased by 81, the result is 54. Find the number.

Click here to see answer by vleith(2825)

Question 180722: I need help please in solving this problem I have tried but keep getting it wrong.
A 30 - ounce can of orange juice sells for $1.80. At the same rate, what would a 12 - ounce can sell for?

Click here to see answer by vleith(2825)

Question 180788: Graph a line. The line through (-2,5) with slope -1.
Click here to see answer by stanbon(57342)

Question 180792: Graphing a line given a point and slope. Draw /1 through (-4,0) and (0,6).What is the slope of any line parallel to /1? Draw /2 through the orgin andf parallel to /1
Click here to see answer by stanbon(57342)

Question 180820: 4 - 2x > 11
when i subtracted 4 from both sides i got: -2x > 11. then i divided that by -2x on both sides and got x < -3.5
the second part i subtracted 4 from both sides and got: -2x > -15. then I divided by -2 and got x < 7.5.
How would the graph look like?
Click here to see answer by jim_thompson5910(28595)

Question 180829: 5x+6y<30
Click here to see answer by Mathtut(3670)

Question 180828: please help me with this problem.
The total height of a building and the flagpole on the roof is 230 feet. The building is 9 times as high as the flagpole. How high is the flagpole?

Click here to see answer by Mathtut(3670)

Question 180836: the differnce of two numbers is 6. if one number is 3 times the other number, find the smaller number.
Click here to see answer by Mathtut(3670)

Question 180938: please help me solve this problem
When a number is increased by 33 the result is 17. Find the number.

Click here to see answer by Alan3354(30993)

Question 180951: I need help please in solving this problem.
Solve the equation: 2/5x – ¾ = 7/20
Click here to see answer by Alan3354(30993)

Question 180965: please help me solve this problem.
Solve the equation: t = 2 + t – 3
4 3

Click here to see answer by Alan3354(30993)

Question 181051: How do you graph f(x)=(1/3)^x ?
Click here to see answer by Mathtut(3670)

Question 181048: Please help me graph f(x)= 4^x+2
Click here to see answer by Mathtut(3670)

Question 181047: Please help with plotting the graph of f(x)= 5^x. Thanks in advance.
Click here to see answer by Mathtut(3670)

Question 181049: please help solve this problem.
Solve the inequality and graph the solution set.
2x - 11 < 9

Click here to see answer by Mathtut(3670)

Question 181045: 2x-5y=15
Click here to see answer by Mathtut(3670)

Question 181044: please help me solve theses problems
Simplify: 4 to the 2nd power – 2(-4x + 2) – 6x/3
Simplify: -3to the 2nd power + 2 [ 20 ( 7 – 11) ]
Click here to see answer by Mathtut(3670)

Question 181052: What is the graph of f(x)= log5x ?
Click here to see answer by josmiceli(9676)

Question 181080: is there a trick to using a graphing calculator i'm really lost and have a big project due in 2 weeks and it depends on using the graphing software and calculator any information will be appreciated.
Click here to see answer by eperette(173)

Question 181129: please help me solve this problem.
Solve the system:
X+y=-5
2x-y=-7

Click here to see answer by stanbon(57342)

Question 181127: Trees in urban areas help keep air fresh by absorbing carbon dioxide. A city has $2100 to spend on planting spruce and maple trees. The land available for planting is 45,000 square feet. Spruce trees cost $60 to plant and require 600 square feet of space. Maple trees cost $40 to plant and require 900 square feet of space. Spruce trees absorb 650lb/yr of carbon dioxide. maple trees absorb 300lb/yr of carbon dioxide.
1) write the two inequalities for this problem.
2) graph both on the same coordinate grid.
I have no idea where to start. Are the two inequalities the amount of space used and the ampunt of CO2 absorbed? Please help....
Click here to see answer by stanbon(57342)

Question 181142: this project is due in 2 weeks and i have no idea how to use this graphing calculator can some one please help we were going to go over this in class today but my kids were out of school.create a graph of the following lines and indicate their points of intersection y=3/5x-4,y=-1/3x+2,y=-5-7 i am supposed to be using graph software and a graphing calculator any tips or instruction will be greatly appreciated thanks
Click here to see answer by solver91311(16885)

Question 181197: #52
find the values of x for which f(x) = g(x)
f(x) = x^2 +2x + 1, g(x) = 7x - 5
Click here to see answer by Mathtut(3670)

Question 181196: #60
Write slope-intercept form of the equation of line through the point
(-3.9,-1.4) perpendicular to 6x +2y = 9
Click here to see answer by Alan3354(30993)

Question 181194: Determine whether the lines L1 and L2 passing through the pairs of points are parallel, perpendicular or neither.
#56
L1 (4,8), (-4,2)
L2 (3,-5), (-1, 1/3)
Click here to see answer by stanbon(57342)

Question 181212: i don't know how to find the slope, x and y intercept of the following equation:
y-6=(x-3)
i was thinking maybe the slope might be 0 but i'm not positive because i've never seen a problem like this.
Click here to see answer by Alan3354(30993)

Question 181231: I just dont get how to do this, I am really bad at math and dont listen very well but here is the question:
The directions say to: Solve each open sentence. Then Graph the solution set.
7.[x-5]=8
8.[b+9]=2
Click here to see answer by Alan3354(30993)

Question 181235: Hi.
May I have some help solving each system graphically if possible?
{3x-y=-3
2x+y=-7
thanks
H.C.
Click here to see answer by Mathtut(3670)

Question 181397: write the equation in slope intercept form of the line that passes through (5,4) and (-6,1)
Click here to see answer by stanbon(57342)

Question 181394: Graph f(x)=-x³+3x+1 by making a table of values. Than determine the consecutive values of x between which each real zero is located.
Click here to see answer by Mathtut(3670)

Question 181396: graph the inequality
y<-1/2x-3
Click here to see answer by Mathtut(3670)

Question 181546: write an equation that gives the income y for working x hours
Click here to see answer by Mathtut(3670)

Question 181553:
if a phone plan charges a flat rate of $20 per month plus .50c per call.
Write an equation of the function.
Click here to see answer by Alan3354(30993)

Question 181553:
if a phone plan charges a flat rate of $20 per month plus .50c per call.
Write an equation of the function.
Click here to see answer by Mathtut(3670)

Question 181576: If a soldier in basic training fores a rocket propelled grenade straight up from the ground level with an initial velocity of 256 ft/sec, then its height above the ground at time t seconds is given by the function h(t) = -16t^2 + 256t.
A. what is the maximum height reached by the grenade?
B. How long does it take for the grenade to reach the ground?
Click here to see answer by Alan3354(30993)

Question 181626: Hello, I need to find the slope of a line, but I'm confused when reading the graph. The point on the x axis is 4 and the point on the y axis is 5. So how would I write the formula. I don't know if 0 should come first or the actual number of 4 and 5. I have (0,4) and (5,0).
Please help
Click here to see answer by stanbon(57342)

Question 181694: write a linear equation to predict the median age that men marry M for any year T
Click here to see answer by Mathtut(3670)

Question 181714: Which best describes the graph of y=3?
A) A horizontal line through the point(1,3)
B) A vertical line through the point(1,3)
C) A horizontal line through the point(3,1)
D) A horizontal line through the point(3,1)
Teacher said the answer is A. Why is it A?
Click here to see answer by stanbon(57342)

Question 181816: The Addition Method x-2y=-1 Solve system by addition
-x+5y=4
Click here to see answer by jim_thompson5910(28595)

Question 181816: The Addition Method x-2y=-1 Solve system by addition
-x+5y=4
Click here to see answer by Mathtut(3670)

Question 181828: Find the slope and y-intercept of the line y = 3x + 4
I tried so hard I just can't get it.
Click here to see answer by jim_thompson5910(28595)

Question 181882: The line through (-2,-1) that is parallel to the line 5x + 3y =9. I am having a horrible time trying to write solve this and then write it into standard form containing only integer coefficients.
Click here to see answer by jim_thompson5910(28595)

Question 181883: The line through (2,-3) that is perpendicular to the line y= -4x + 8 written in standard form containing only integer coefficients. I am having a horrible time with these graphs, any help is greatly appreciated!
Click here to see answer by jim_thompson5910(28595)

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