Questions on Algebra: Equations answered by real tutors!

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Question 107218: Rewrite the equation so that y is a function of x
1+7y=5x-2
Click here to see answer by stanbon(75887)

Question 107163: please help me with this problem
ive been working on it for 15 min already
the problem is
2(x-4)=22
i have to solve for x
i cant get the anwser at all
Click here to see answer by bucky(2189)

Question 107211: What is the solution to the system of equations:
2x +5y + 2z = 6
5x - 7y = -29
z = 1
I have tried this:
SUBSTITUTION
2x + 5y + 2(1) = 6
2x + 5y = 4
I have tried to solve for y using these equations:
2x + 5y = 4
5x - 7y = -29
MULTIPLY BY 2.5
5x + 7.5y = 10
I have tried to solve for y using these equations:
5x + 7.5y = 10
5x - 7y = -29
ELIMINATION
14.5y = 39
This would show that y > 2, but upon checking the answers from a resource (This is not a section of the textbook I am using), the answer is in fact, 2. Would you help me see where I made a mistake?

Click here to see answer by Annabelle1(69)

Question 107145:
Solve the equation
Click here to see answer by Joeshie(9)

Question 107228: -25+4(2x-5)=-61
Click here to see answer by scott8148(6628)

Question 107207: 3/4(3X+1)=2(3-2X)=1

Click here to see answer by Joeshie(9)

Question 106025: IF THE SIDES EQUAL A A 2A 2A D AND D IN A SHAPE WHAT WOULD THE EQUASION BE FOR THE PERIMITER IN ITS SIMPLEST FORM
Click here to see answer by Joeshie(9)

Question 107304: Solve and check each of the following equations for x.
3/x = 5/3 � 7/x

Click here to see answer by jim_thompson5910(35256)

Question 107352: i need to solve for y in this equation
thank you in advance
y+5-4y=-10
Click here to see answer by T. Kidder(2)

Question 107384: 4(2x-3)=3x+13
Click here to see answer by Annabelle1(69)

Question 107345: Find the coordinates of the midpoint of a segment with the pair of endpoints
(-7.-6). (-8.8)
a. (1/2, -7) b. (-1,-16) c. (-15/2,1) d. (-13/2,0)
Click here to see answer by bucky(2189)

Question 107339: I believe I have this correct. Can you please check it for me.
3x^2+5x-3=x
3x^2+5x-3-x=0
3x^2+4x=3
Thank You
Click here to see answer by bucky(2189)

Question 107347: Find the coordinates of the midpoint of a segment with the pair of endpoints
(11 1/2, 0), (-11 1/2, 0)
a. (0,0) b. (0 1/2, 0) c. (-1 1/2, 0) d. (11, 0)

Click here to see answer by Fombitz(32388)

Question 107508: You fill your car's gas tank when it is about 1/2 empty. The next week, you fill the tank a second time when it is about 3/4 empty. If you buy a total of 18 1/2 gallons of gas on these two days, about how many gallons does that tank hold?
Click here to see answer by stanbon(75887)

Question 107544: Okay I have this word problem:
A collection of 40 dimes and nickels is worth $2.90. How many nickels are there?
I came up with this equation:
(d=dimes)
0.1d+0.05(40-d)=2.9
I got an incorrect answer according to the answer in the back of the textbook, and according to the equation solver on this site, neither of the other answers were correct. Help me!
Click here to see answer by ankor@dixie-net.com(22740)

Question 107552: Here is the equation that I can not solve.
x =3/10
y= 1/2
2/5x^3y^2 + 1/3x^2y^2 + 3/5x^3y^2 + 1/10x^3y^2 +x^2y^2 + 4 +2xy + xy + 5 =
First I grouped the ones alike
4+5=9
2/5x^3Y^2 + 3/5x^3y^2 + 1/10x^3y^2
1/3x^2y^2 + x^2y^2
2xy + xy
I do not know where to go know.
Please help me.
Click here to see answer by stanbon(75887)

Question 107545: Okay I have this word problem:
A collection of 40 dimes and nickels is worth $2.90. How many nickels are there?
I came up with this equation:
(d=dimes)
0.1d+0.05(40-d)=2.9
I got an incorrect answer according to the answer in the back of the textbook, and according to the equation solver on this site, neither of the other answers were correct. Help me!
Click here to see answer by stanbon(75887)

Question 107563: pls advise how to solve this:
a ladder 10 ft. long is leaning against a building. how high on the building will the ladder be when the bottom of the ladder is 6ft from the building?

Click here to see answer by stanbon(75887)

Question 107591: Tell wether the number is prime or composite,if it is composite write prime factorization.
4.97
Any help with this problem would be GREATLY appreciated.
Click here to see answer by stanbon(75887)

Question 107594: Tell wether the number is prime or composite,if it is composite write prime factorization.
5. 132
Any help wit this problem would be GREATLY appreciated:)
Click here to see answer by stanbon(75887)

Question 107595: Tell wether the number is prime or composite,if it is composite write prime factorization.
6. 114
Any help with this problem would be GREATLY appreciated:)
Click here to see answer by scott8148(6628)

Question 107597: Tell wether the number is prime or composite,if it is composite write prime factorization.
8. 345
Any help with this problem would be GREATLY appreciated:)
Click here to see answer by scott8148(6628)

Question 107603: Find the number of Calories in an orange and in a peach.
1. An orange has 30 Calories more than a peach.
2. Thirteen peaches have as many Calories as 7 oranges.
Click here to see answer by solver91311(24713)

Question 107635: Suppose a cost-benefit model is given by:

Where y is the cost for removing x percent of a given pollutant. what percentage of pollutant can be removed for $23,000.00?
Click here to see answer by solver91311(24713)

Question 107634: Determine whether the equation is an identity, a conditional equation, or an inconsistant equation.
1/(x+5) + 2/(x+3) = -2/(x^2 + 8x +15)
Click here to see answer by Fombitz(32388)

Question 107637: find all the values of x satisfying the given conditions
1 2 -4
y1= --- , ----, ---------, and y1+y2=y3
x+7 x+3 x^2+10+21

Click here to see answer by solver91311(24713)

Question 107644: PLease help me solve: -1/3 - 5/4y= 3/4 - 1/6y
Click here to see answer by jim_thompson5910(35256)

Question 107660: determine whether the equation is an identity, a conditional equation, or an inconsistent equation.
2x-3+9x-4 = 3x+8x-10
Click here to see answer by jim_thompson5910(35256)

Question 107660: determine whether the equation is an identity, a conditional equation, or an inconsistent equation.
2x-3+9x-4 = 3x+8x-10
Click here to see answer by stanbon(75887)

Question 107661: determine whether the equation is an identity, a conditional equation or an inconsistent equation.
-4(x+6)+6=2x-6(x+7)
Click here to see answer by jim_thompson5910(35256)

Question 107661: determine whether the equation is an identity, a conditional equation or an inconsistent equation.
-4(x+6)+6=2x-6(x+7)
Click here to see answer by stanbon(75887)

Question 107640: write the value(s) that make the denominator(s) zero, then solve the equation.
x-6 x+8
--- + 2 = ---
3x x
Click here to see answer by stanbon(75887)

Question 107622: Find the number of Calories in a stalk of celery and in a carrot.
1. A carrot has 13 Calories more than a celery stalk.
2. Five carrots and ten celery stalks have only 170 Calories.

Click here to see answer by scott8148(6628)

Question 107673: �3(10x � 3) + 10(3x � 3) = x � 7
Click here to see answer by jim_thompson5910(35256)

Question 107710: I need help with pre-algebraand algebra i think it will help me if I had example problems.I have touble remembering formulas.I am trying to get into a selective enrollment highschool, and i am barely getting by in math.Please help me.
Click here to see answer by anne(47)

Question 107725: if every fourth trick- or- treater is a vampire, and every 6th a robot , how many of each will you see if 75 trick- or- treaters come to your door?
i need the steps on how u solve this problem.
THANK YOU:)
Click here to see answer by edjones(8007)

Question 107781: Find two consecutive odd integers such that 5 times the first integer is 12 more than 3 times the second.
Click here to see answer by checkley71(8403)

Question 107786: hey everyone i jus have a really quick question its probably so simple but for whatever reason im jus not gettin it here it is:
T= 0.0848*a/(0.47)^2
T=0.3839 a__________(3)
All i wana know is where did 0.3839 come from i no "a" still remains in the formula and we are jus simplifying the expression if some one could show me stepwise how they simplified that to get 0.3839a greatly appriciate it
thankz
Click here to see answer by josmiceli(19441)

Question 107826: Please help me solve this problem into an equation
Click here to see answer by MathLover1(20849)

Question 107826: Please help me solve this problem into an equation
Click here to see answer by jim_thompson5910(35256)

Question 107828: please help me answer this problem into an equation
Click here to see answer by MathLover1(20849)

Question 107865: x-11=5
and
0=x-7
Click here to see answer by checkley71(8403)

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30331..30375, 30376..30420, 30421..30465, 30466..30510, 30511..30555, 30556..30600, 30601..30645, 30646..30690, 30691..30735, 30736..30780, 30781..30825, 30826..30870, 30871..30915, 30916..30960, 30961..31005, 31006..31050, 31051..31095, 31096..31140, 31141..31185, 31186..31230, 31231..31275, 31276..31320, 31321..31365, 31366..31410, 31411..31455, 31456..31500, 31501..31545, 31546..31590, 31591..31635, 31636..31680, 31681..31725, 31726..31770, 31771..31815, 31816..31860, 31861..31905, 31906..31950, 31951..31995, 31996..32040, 32041..32085, 32086..32130, 32131..32175, 32176..32220, 32221..32265, 32266..32310, 32311..32355, 32356..32400, 32401..32445, 32446..32490, 32491..32535, 32536..32580, 32581..32625, 32626..32670, 32671..32715, 32716..32760, 32761..32805, 32806..32850, 32851..32895, 32896..32940, 32941..32985, 32986..33030, 33031..33075, 33076..33120, 33121..33165, 33166..33210, 33211..33255, 33256..33300, 33301..33345, 33346..33390, 33391..33435, 33436..33480, 33481..33525, 33526..33570, 33571..33615, 33616..33660, 33661..33705, 33706..33750, 33751..33795, 33796..33840, 33841..33885, 33886..33930, 33931..33975, 33976..34020, 34021..34065, 34066..34110, 34111..34155, 34156..34200, 34201..34245, 34246..34290, 34291..34335, 34336..34380, 34381..34425, 34426..34470, 34471..34515, 34516..34560, 34561..34605, 34606..34650, 34651..34695, 34696..34740, 34741..34785, 34786..34830, 34831..34875, 34876..34920, 34921..34965, 34966..35010, 35011..35055, 35056..35100, 35101..35145, 35146..35190, 35191..35235, 35236..35280, 35281..35325, 35326..35370, 35371..35415, 35416..35460, 35461..35505, 35506..35550, 35551..35595, 35596..35640, 35641..35685, 35686..35730, 35731..35775, 35776..35820, 35821..35865, 35866..35910, 35911..35955, 35956..36000, 36001..36045, 36046..36090, 36091..36135, 36136..36180, 36181..36225, 36226..36270, 36271..36315, 36316..36360, 36361..36405, 36406..36450, 36451..36495, 36496..36540, 36541..36585, 36586..36630, 36631..36675, 36676..36720, 36721..36765, 36766..36810, 36811..36855, 36856..36900, 36901..36945, 36946..36990, 36991..37035, 37036..37080, 37081..37125, 37126..37170, 37171..37215, 37216..37260, 37261..37305, 37306..37350, 37351..37395, 37396..37440, 37441..37485, 37486..37530, 37531..37575, 37576..37620, 37621..37665, 37666..37710, 37711..37755, 37756..37800, 37801..37845, 37846..37890, 37891..37935, 37936..37980, 37981..38025, 38026..38070, 38071..38115, 38116..38160, 38161..38205, 38206..38250, 38251..38295, 38296..38340, 38341..38385, 38386..38430, 38431..38475, 38476..38520, 38521..38565, 38566..38610, 38611..38655, 38656..38700, 38701..38745, 38746..38790, 38791..38835, 38836..38880, 38881..38925, 38926..38970, 38971..39015, 39016..39060, 39061..39105, 39106..39150, 39151..39195, 39196..39240, 39241..39285, 39286..39330, 39331..39375, 39376..39420, 39421..39465, 39466..39510, 39511..39555, 39556..39600, 39601..39645, 39646..39690, 39691..39735, 39736..39780, 39781..39825, 39826..39870, 39871..39915, 39916..39960, 39961..40005, 40006..40050, 40051..40095, 40096..40140, 40141..40185, 40186..40230, 40231..40275, 40276..40320, 40321..40365, 40366..40410, 40411..40455, 40456..40500, 40501..40545, 40546..40590, 40591..40635, 40636..40680, 40681..40725, 40726..40770, 40771..40815, 40816..40860, 40861..40905, 40906..40950, 40951..40995, 40996..41040, 41041..41085, 41086..41130, 41131..41175, 41176..41220, 41221..41265, 41266..41310, 41311..41355, 41356..41400, 41401..41445, 41446..41490, 41491..41535, 41536..41580