Questions on Algebra: Systems of equations that are not linear answered by real tutors!

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Question 104307: what are the steps and some example. For Soling systems of equations. like
y+x=4
y=-4x+10
Click here to see answer by elima(1433)

Question 104592: 3/2L=-4m what is L
Click here to see answer by stanbon(57387)

Question 105055: What is
Click here to see answer by HyperBrain(694)

Question 105204: Thanks in advance for considering this question.
Recently on a desert trip to Utah, I dropped a stone from the ledge of a canyon and timed the return sound of the stone hitting the bottom. Ultimately hoping to calculate the distance to the bottom of the canyon(ignoring certain real world phenomenom such as the whole terminal velocity vs. accelleration due to gravity in a vacuum and the fact that sound doesn't travel in a vacuum thing)I have attempted to solve for the following 3 unkowns algebraically. The total time (TT) is the summation of the time for the rock to hit bottom (TR) plus the time for the sound to return (TS).
TT = TR + TS
Assuming an initial velocity of 0, the distance (D) can be represented by the formula:
D = (.5)(accelleration due to gravity)(TR squared)= (.5)(32f/s/s)(TR squared)
Therefore TR = the square root of the quantity [D/[(.5)(32f/s/s)]]
Sound travels at 1087 ft. per second (ignoring certain environmental factors)and therefore TS = D/1087
TT is known, TR, TS, and D are unknown. We have three equations and 3 unknowns. I started by using TT = TR + TS and replacing TR and TS with the two distance equations i.e. TT = [square root of the quantity D/[(.5)(32f/s/s)]]+[(D/1087)] and trying to solve for D. Can't seem to get er done. Please help with solution and insights (solve for TT in general and I'll be back in the desert throwing rocks down canyons of known depth in no time)!
Thanks
Click here to see answer by scott8148(6628)

Question 105054: I need help solving this problem 3x-7=x-9
Click here to see answer by checkley75(3666)

Question 105383: Solve the system by substitution.
x + 5y = 0
–2x – 4y = 6

Click here to see answer by justices98(1)

Question 105411: Adult tickets for a play cost $16 and child tickets cost $3. If there were 23 people at a performance and the theater collected $199 from ticket sales, how many adults and how many children attended the play?
Click here to see answer by checkley75(3666)

Question 105416: An airplane covered 14 miles of its route while decreasing its altitude by 13,000 feet. Find the slope of the airplane's line of descent. Round to the nearest hundredth. [Hint: 1 mi = 5280 feet.]
Click here to see answer by checkley75(3666)

Question 105420: Determine which two equations represent parallel lines.
(a) y = –7x + 4
(b) y = 7x + 4
(c) y = x + 4
(d) y = –7x + 9

Click here to see answer by checkley75(3666)

Question 105418: Solve the system by graphing.
x + y = 4
–x + y = 2

Click here to see answer by checkley75(3666)

Question 105419: Determine which two equations represent parallel lines.
(a) y = –7x + 4
(b) y = 7x + 4
(c) y = x + 4
(d) y = –7x + 9

Click here to see answer by checkley75(3666)

Question 105426: I have this question 2x...different answers to pick from...please help me out??
Find the slope of the line passing through the points (–2, 7) and (8, –1).
1st set of answers...
a.)5/4
b.)-5/4
c.)4/5
d.)-4/5
2nd set of answers...
a.)0
b.)1
c.)-4
d.) Undefined
how is this possible and can it broken down into steps?
Click here to see answer by checkley75(3666)

Question 105435: Find the slope of any line perpendicular to the line through points (2, 11) and (3, 4).
Click here to see answer by checkley75(3666)

Question 105437: combine like terms...
6a^2+4a+5+3a^2+7a-2
Click here to see answer by Ahmath(7)

Question 105439: combine like terms...
6a^2+4a+5+3a^2+7a-2
Click here to see answer by jim_thompson5910(28598)

Question 105424: I have this question 2x...different answers to pick from...please help me out??
Find the slope of the line passing through the points (–2, 7) and (8, –1).
1st set of answers...
a.)5/4
b.)-5/4
c.)4/5
d.)-4/5
2nd set of answers...
a.)0
b.)1
c.)-4
d.) Undefined
how is this possible and can it broken down into steps?
Click here to see answer by jim_thompson5910(28598)

Question 105458: Complete the ordered pairs for the equation y = 5x + 5.
(?,0), (4/5,?), (0,?), (-4/5,?)
Click here to see answer by checkley75(3666)

Question 105462: One number is 3 less than another. If 7 times the smaller number minus 3 times the larger number is 7, find the two numbers.
Click here to see answer by checkley75(3666)

Question 105460: Match the graph with one of the equations.
Crosses at (0,2) & (2,0)

A) y = –x – 2
B) y = x – 2
C) y = –x + 2
D) y = x + 2

Click here to see answer by checkley75(3666)

Question 105459: Match the graph with one of the equations.
Crosses at (0,2) & (2,0)

A) y = –x – 2
B) y = x – 2
C) y = –x + 2
D) y = x + 2

Click here to see answer by MathLover1(6638)

Question 105488: Evaluate: 70 ÷ 7 – 15 ÷ 5
Click here to see answer by Alex0130(1)

Question 105434: Find the slope and the y-intercept.
y = 2x – 4

Click here to see answer by edjones(7569)

Question 105493: Graph the inequality.
x – y < 2

Click here to see answer by jim_thompson5910(28598)

Question 105485: An airplane covered 14 miles of its route while decreasing its altitude by 13,000 feet. Find the slope of the airplane's line of descent. Round to the nearest hundredth. [Hint: 1 mi = 5280 feet.]
Click here to see answer by elima(1433)

Question 105491: Graph the inequality.
x – y < 2

Click here to see answer by elima(1433)

Question 105710: Here is the question:
Solve the following system of equations using elimination. Show all of your work. Once you solve the system, explain each step in solving the process. Include what you did and why you did it. State the solution and explain what the solution actually tells you about the system of equations.
6x+3y=27
-4x+7y=27
This is what I started, but I'm not sure if it's right....
7(6x+3y=27) = 42x+21y=189
-3(-4x+7y=27) = 12x-21y=81
Click here to see answer by bucky(2189)

Question 105417: Solve the system by graphing.
x + y = 4
–x + y = 2

Click here to see answer by alvinjohnburgos(11)

Question 107473: graph the solution set for the equation
y=-2/3x-2
i am trying to use Graph but it does not seem to be working for this problem.
please help
Click here to see answer by MathLover1(6638)

Question 107769: Solve each of the following by graphing
2x+y=8
2x-y=0
Click here to see answer by MathLover1(6638)

Question 107770: Solve each of the following by graphing
3x-y=3
3x-y=6
Click here to see answer by MathLover1(6638)

Question 107768: Solve each of the following by graphing
3x-2y=6
2x-y=5
Click here to see answer by jim_thompson5910(28598)

Question 107767: Solve each of the following by graphing
x-y=4
2x-2x=8
Click here to see answer by jim_thompson5910(28598)

Question 107766: Solve each of the following by graphing
x+2y=4
x-y=1
Click here to see answer by jim_thompson5910(28598)

Question 107771: Solve each of a linear inequalities graphically.
x+2y<4
x-y>1
Click here to see answer by MathLover1(6638)

Question 107771: Solve each of a linear inequalities graphically.
x+2y<4
x-y>1
Click here to see answer by jim_thompson5910(28598)

Question 108039: Write in slope-intercept form.
(-2/3,4) (6,-1/3)
Click here to see answer by checkley71(8403)

Question 105635: The length of the shadow of a building is 2 feet more than 2/3 the height of the building and it is also 12 feet less than the height. How high is the building?
Click here to see answer by HyperBrain(694)

Question 105382: Solve the system by substitution.
x + y = 12
y = 2x

Click here to see answer by HyperBrain(694)

Question 105433: Find the slope and the y-intercept.
y = 2x – 4

Click here to see answer by HyperBrain(694)

Question 98999: Solve the system of equations by graphing
y= -x-10
7x-6y=8
Click here to see answer by HyperBrain(694)

Question 108296: At 10:00 A.M. a car leaves a house at a rate of 60mi/h. At the same time another car leaves the same house at a rate of 50mi/h in the opposite direction. At what time will the cars be 330 miles apart?
Click here to see answer by stanbon(57387)

Question 108366: When graphing exponential and logarithmic functions can the lines pass into the 3rd quadrant?
Click here to see answer by stanbon(57387)

Question 108646: Number Theory Adding a three-digit number 5Z7 to 256 gives XY3. IfXY3 is divisible by 3, then what is the largest possible value of Z?
Click here to see answer by ankor@dixie-net.com(15660)

Question 108661: This is system of equations substitution.I need help with
y=2x-4
y=3x
Click here to see answer by scott8148(6628)

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