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

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Question 452242: Can I please have some help with the following
3x+9y=21
-8x+y=19

7m+n=1
m-2n=13
Click here to see answer by mananth(16946)

Question 452212: solve the system by graphing:
y=-x-2
y=2x+13
Click here to see answer by mananth(16946)

Question 452450: what is the slope and y intercept of x>2
Click here to see answer by stanbon(75887)

Question 452459: Please help me solve this equation
Graph the system of inequalities. Show all of your work.
y < x - 5
2x + 4y > 8
Click here to see answer by stanbon(75887)

Question 452482: 6<-4x+5 or 9<=-5x+3
What is the solution to the compound inequality.
Click here to see answer by lwsshak3(11628)

Question 452527: (6,-5);7x+3y=5
Click here to see answer by Alan3354(69443)

Question 452463: Write an equation of the line satisfying the given conditions. A line perpendicular to y = 2 + 3x.

Click here to see answer by poliphob3.14(115)

Question 452728: As a mother, I am having problems remembering the - and + on the algebra.
9<-3X
If I am correct then it would be -3
Click here to see answer by ilana(307)

Question 452773: What is intercept for the graph 8x-2y=8
Click here to see answer by rfer(16322)

Question 452806: Graph the equation and identify the y-intercept.
y= -2/3x+4
Click here to see answer by jim_thompson5910(35256)

Question 453097: How do you know if the parabola opens upward or downward? What are 3 key points you can determine and graph from the equation? Demonstrate with an example.

Click here to see answer by stanbon(75887)

Question 453231: how do i sovle and graph the inequality: {xeR| |x+2|<5}
Click here to see answer by stanbon(75887)

Question 453395: find the equation of the line between (1,4)and(3,1)
I couldn't find an area for slopes, hope this works out. thanks in advance.
Click here to see answer by mananth(16946)

Question 453391: find the equation of the line between (1,4)and(3,1), don't actually need to graph this, i thought this would be the best section for the question.
Thanks in advance.
Click here to see answer by mananth(16946)

Question 453388: graph y=2x+3
Click here to see answer by mananth(16946)

Question 453427: what is the solution of the following system of equation
2x+y=6
3x-7y=9
Click here to see answer by ichudov(507)

Question 453502: Using correct mathematical notation and symbols, express the following in set-builder notation: Z = {2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12}
Click here to see answer by Edwin McCravy(20054)

Question 453449: So;lve each inequality
1.) -61 > b-31

2.) FiFteen is greater than a number minus 7.
3. A number plus 11 is less than of equal to 9.

Solve each problem by either drawing a diagram or writing an equation. Ezplain why you chose the method you did.
1. There are 45 students with in Jasons class. One-ninth of the students have hazel eyes. How many students have hazel eyes?
2. Alice is making casserole snacks. Each snack will be 2 inches by
4 inches. How many snacks will she have if she bakes 4 batches,
each in a 12-inch by 16-inch baking pan?

Choose a strategy to solve each problem.
3. Suppose you buy a basketball at a garage sale for $3.You then
sell the ball to a friend for $4.25.You buy the ball back for $4.75,
and then sell the ball for $5. How much money do you make?

4.
Derek gave Kyle half of his marble collection. Kyle gave Janis
half of the marbles he received from Derek. Janis kept 12 of the
marbles and gave the remaining 16 to Jill. How many marbles
did Derek give to Kyle?

5. Use a calculator or a table of square roots to find each square root to
the nearest tenth.
a. 43
b. 71
c. 56
d. 167
e. 214
f. 1,421
tELL WHEATHER EACH NUMBER IS RATIONAL.
18
3/8
6.831
Click here to see answer by edjones(8007)

Question 453542: Graph each line and shade appropriate portion, identify common shaded area
� Find coordinates of all corner points
-2x + y ≤ 6, x ≤ 2, x ≥ 0, y ≥ 0
Click here to see answer by kieoshag87(1)

Question 453655: please show me how to graph y=3(1.9)^x... explain
Click here to see answer by solver91311(24713)

Question 453831: I know the answer is k > -21 for 5(2k+3)-2(k-8)>3(2k+4)+k-2
but I don't know the steps on how you get that answer !
Click here to see answer by robertb(5830)

Question 453858: Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this.
8x + 11y = -50
-32x � 44y = -200

Click here to see answer by mananth(16946)

Question 453970: A student has an average of 72 on four exams. If the final exam is to count double, what score does she need to have an averge of 80?
Click here to see answer by richwmiller(17219)

Question 454042: how to find intercepts for -3x+8y=24?
Click here to see answer by josmiceli(19441)

Question 454076: The lost value of equipment over a period of time is called depreciation. The simplest method for calculating depreciation is straight-lne depreciation. The annual straight-line depreciation D of an item that costs x dollars with a useful life of n years is D= (1/n)x. Find the depreciation for items with the given characteristics.
Cost is $15,968; life is 13 yr
The annual straight-line depreciation is approximately $_ per year.
(Round to hte nearest cent.)
Thankyou for your help it is much appreciated.
Click here to see answer by stanbon(75887)

Question 454094: Which of the following is the equation of the axis of symmetry of the quadratic equation y = 2x^2 + 24x + 62
Click here to see answer by richwmiller(17219)

Question 454094: Which of the following is the equation of the axis of symmetry of the quadratic equation y = 2x^2 + 24x + 62
Click here to see answer by rwm(914)

Question 454094: Which of the following is the equation of the axis of symmetry of the quadratic equation y = 2x^2 + 24x + 62
Click here to see answer by Alan3354(69443)

Question 454092: In a certain question, total alcoholic beverage sales were $110.4 billion in 2006 and 134.1 billion in 2009.
(a) Let the x-axis denote time and the y-axis denote the amount of alcohol sales (in billions). Let x = 0 correspond to 2006. Fill in the blanks: The given data is represented by the points (__,100.4) and (3,___).
(b) Find the linear equation determined by the two points in part (a)
(c) Use the equation in part (b) ot estimate the alcohol sales produced in 2008.
(d) If the model remains accurate, when do alcohol sales reach $170 billion?
Thankyou for the help. It is much appreciated.
Click here to see answer by josmiceli(19441)

Question 454276: How do I graph of the following:
3x+y=5
-2x+3y=4

Click here to see answer by mananth(16946)

Question 454401: How do i graph the equation x+5y=20

Click here to see answer by solver91311(24713)

Question 454401: How do i graph the equation x+5y=20

Click here to see answer by mananth(16946)

Question 454405: if the point (k;-5)lies on the line 2x+ 4y=8 , find k
Click here to see answer by solver91311(24713)

Question 454417: Graph the system of inequalities. y is less than or equal to -5
x is less than or equal to 6. I will need the plot points because I have a really hard time understanding graphing.
Click here to see answer by stanbon(75887)

Question 454677: Rate of Change Each of the following is the slope of a line
representing daily revenue in terms of time in days. Use the
slope m to interpret any change in daily revenue for a one-day
increase in time.
m=800
Click here to see answer by stanbon(75887)

Question 454864: use rational exponents to write x^1/2*y^1/8*z^1/6 as a singel radical expression
Click here to see answer by MathLover1(20849)

Question 454864: use rational exponents to write x^1/2*y^1/8*z^1/6 as a singel radical expression
Click here to see answer by Alan3354(69443)

Question 454889: I need help with simplifing by removing factor of 1. Is this the same as simple factoring? The problems I am trying to solve are:
1) 7q^2+7q/14q^2+49q (that is 7q (q to the power of 2) plus 7q over(/) 14q^2 (that si 49 q (q to the power of 2) plus 49q.
2) t^2-81/(t+9)^2 (that is t to the power of 2)minus 81 over(/) (t-9)to the power of 2). Any explanation would be greatly appreciated.
Click here to see answer by scott8148(6628)

Question 454880: solve the system of equations by graphing
4x-y=14
4x+5y=2
Click here to see answer by mananth(16946)

Question 454986: Hello, I need help with the following problem:
Sketch the graph of f(x)=(x-1)^3(x+2)^2(x-3). What is the behavior of f near each zero? What is the end-behavior of f itself?
Find intercepts and set up a sign graph.
Write a polynomial equation of the last possible degree, and leading coefficient one, which has real coefficients, and {2,-2,i} as its zeros.
Thank you so much.
Click here to see answer by stanbon(75887)

Question 455016: Graph the following equations (use points to help you graph)
x+2y=1
Click here to see answer by MathLover1(20849)

Question 455017: Graph the following equations (use points to help you graph)
y=-x+2
y=-5x-6
solution=(__,__)?
Click here to see answer by Alan3354(69443)

Question 455057: What is the y-intercept and the type of slope when the following inequality is graphed: y < -3
Click here to see answer by rfer(16322)

Question 455130: Find an equation of the line having the given slope and containing the given poing.
m=4/5, (2,-3)
The equation of the line is y =
(Simplify your answer. Type your answer in slope-intercept form. Use integers or fractions for any numbers in the expression.)
I appreciate your help with this problem.
Click here to see answer by stanbon(75887)

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