Questions on Algebra: Expressions involving variables, substitution answered by real tutors!

Tutors Answer Your Questions about Expressions-with-variables (FREE)

Question 267422: Here is a confusing question for me: The ratio of Aldo's cycling speed to Jose's cycling speed is 6:5. Jose leaves school at 3 P.M. and Aldo leaves at 3:10 P.M. By 3:30, Aldo is only 2 km behind Jose. How fast is each cycling?
Click here to see answer by ankor@dixie-net.com(15652)

Question 267714: what is the substitution for
4y+4x=40
y=3x-30
Click here to see answer by dabanfield(803)

Question 267721: What is the answer to this negative exponents problem 8^-2y^-6
Click here to see answer by josmiceli(9678)

Question 267862: How do I write a slope intercept form of the equation of a line?
Click here to see answer by Alan3354(30993)

Question 267909: 5x+2y=18
2x+3y=16
Click here to see answer by palanisamy(496)

Question 268005: 3x-4y=12;y
Click here to see answer by asuar010(324)

Question 268003: 8x+4y=12;y
Click here to see answer by Alan3354(30993)

Question 267731: a plane takes 3 hours to travel 1,503 miles with the wind. It can travel only 1,179 miles against the wind in the same time. Find the speed of the wind and the speed of the plane in still air.
Click here to see answer by ankor@dixie-net.com(15652)

Question 268251: x^3-3x^2-x+3=0
How do you solve this?
Click here to see answer by vleith(2825)

Question 268256: Solve:
x^3+4x^2-4x-16=0
Click here to see answer by scott8148(6628)

Question 268422: Two planes leave Chicago - one traveling due east and the other due west. The first travels 100 miles per hour faster than the second. How long will it be until they are 2000 miles apart? ( If there is not enough information given, indicate that no solution can be found)

Click here to see answer by checkley77(12569)

Question 268420: 2/3(36x-6)=68
Click here to see answer by checkley77(12569)

Question 268773: Chad has a total of 5 people in his family. sally is chad's twin sister. Chad's sister Hailey is 4 years older than Chad. Chad's mother was 24 when chad was born. Chad's father is four years older that chad's mother. write an expression for family member's age as a function of chad's age (x)
Click here to see answer by ptaylor(2048)

Question 268491: -1/2x=-7/8 whats x. i know to change the den to 8 and then multply
Click here to see answer by ankor@dixie-net.com(15652)

Question 269055: I need help in solving this problem:
Multiply & simplify your answer
(r+1/3)(r+1/2)
thanks,
Click here to see answer by persian52(158)

Question 269013: 40x+26y=486.70
20x+31y=332.42
Click here to see answer by persian52(158)

Question 269013: 40x+26y=486.70
20x+31y=332.42
Click here to see answer by checkley77(12569)

Question 269010: 9x+3y=899.40
12x+2y=1139.30
Click here to see answer by persian52(158)

Question 268489: solve -0.7x<-14
Click here to see answer by persian52(158)

Question 269056: Need help in solving this problem:
Divide and simplify.
11v-88 over 4 divided by v-8 over 22b
thanks,

Click here to see answer by Alan3354(30993)

Question 269210: S=pt determine the units on t if S is measured in dollars and p is measured in dollars per year
Click here to see answer by unlockmath(1599)

Question 269157: Solve -2(x-7)-140=5x-7(x+8).
Click here to see answer by persian52(158)

Question 269296: If Z=1/2 what is the greatest value of the expression -(z^2z^-4)^-3?
Click here to see answer by stanbon(57347)

Question 269296: If Z=1/2 what is the greatest value of the expression -(z^2z^-4)^-3?
Click here to see answer by Alan3354(30993)

Question 269824: y-24= -7
Click here to see answer by checkley77(12569)

Question 269784: How do I figure out 3x+2=5x
Click here to see answer by checkley77(12569)

Question 269985: please help me solve this equation: x+3y=56
Click here to see answer by Tobiasz(54)

Question 270013: How do you factor x^2+6xy+y^2?
Click here to see answer by Alan3354(30993)

Question 270062: Solve the inequality:
2* |-11-7x| > 12
Click here to see answer by Tobiasz(54)

Question 270062: Solve the inequality:
2* |-11-7x| > 12
Click here to see answer by Alan3354(30993)

Question 270066: Solve the equation.

6x^(-1/2) - 13x^(-1/4) +6 = 0
Click here to see answer by stanbon(57347)

Question 270063: Solve the inequality:
2 / ( |2x+3| ) >= 5
Click here to see answer by edjones(7569)

Question 270089: Solve the equation.
6x^(-1/2) - 13x^(-1/4) +6 = 0

** Someone tried to help me with this saying to set w = x^(-1/4) but thats wrong when you take w^2 it does not give you (1/2) it gives you (1/8)
Click here to see answer by palanisamy(496)

Question 270432: How do you solve:
9x = 10y
3x-2y = 12
Use the elimination method to solve the system
Thank you!
Click here to see answer by Greenfinch(383)

Question 270459: How do you solve:
2x + 5y + 13 =0
2x + 5 =3y
Use the elimination method to solve the system
Thank you!
Click here to see answer by persian52(158)

Question 270757: -3(2-y)+4=10
Click here to see answer by stanbon(57347)

Question 270948: Need formula and solution so I can do others- Dried apricots worth #4.25 a pound were mixed with dried prunes worth $4.75 a pound to produce a mixture of dried fruit worth $94.75. How much of each kind of fruit was used to produce 25 pounds of mixture?
Click here to see answer by ankor@dixie-net.com(15652)

Question 271246: Solve teh missing variable.
6x+5Y=-8 Where (2, y)
Click here to see answer by stanbon(57347)

Question 271310: which algebraic expression represents (eight less than half a number)
Answers are a) 8 - 1/2x b) 1/2x - 8 c) 1/2(x-8) d) (6 -1/2)x
Not sure how to do this, please help. Thanks
Click here to see answer by stanbon(57347)

Question 271363: Solve for X and Y in the following problems using either substitution or elimination methods. X + Y = 10, 3X + Y = 12
Click here to see answer by checkley77(12569)

Question 271613: what is the vaule of y in the equation x=3y+5
Click here to see answer by mananth(12270)

Question 271605: 8x - 2y = -12
2x = 4y
Click here to see answer by LarissaRichardson(34)

Question 271715: A thief steals a number of rare plants from a nursery. On his way out, the thief meets three security guards, one after another. To each security guard the thief is forced to give one-half the plants that he still has, plus two more. Finally, the thief leaves the nursery with no plants. How many plants were originally stolen?
Click here to see answer by solver91311(16885)

Question 271718: The first three digits of Sophie’s telephone number are 279. If 70 is added to Sophie’s age, this sum is 5939 less than three times the number formed by the last four digits of Sophie’s phone number. If Sophie is 30 years old, what is her telephone number?
Click here to see answer by dabanfield(803)

Question 271719: Three children in a family were born at a 4-year intervals. Six years ago, the sum of their ages was 18. Find the present ages of the children.
Click here to see answer by richwmiller(9135)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840, 6841..6885, 6886..6930, 6931..6975, 6976..7020, 7021..7065, 7066..7110, 7111..7155, 7156..7200, 7201..7245, 7246..7290, 7291..7335, 7336..7380, 7381..7425, 7426..7470, 7471..7515, 7516..7560, 7561..7605, 7606..7650, 7651..7695, 7696..7740, 7741..7785, 7786..7830, 7831..7875, 7876..7920, 7921..7965, 7966..8010, 8011..8055, 8056..8100, 8101..8145, 8146..8190, 8191..8235, 8236..8280, 8281..8325, 8326..8370, 8371..8415, 8416..8460, 8461..8505, 8506..8550, 8551..8595, 8596..8640, 8641..8685, 8686..8730, 8731..8775, 8776..8820, 8821..8865, 8866..8910, 8911..8955, 8956..9000, 9001..9045, 9046..9090, 9091..9135, 9136..9180, 9181..9225, 9226..9270, 9271..9315, 9316..9360, 9361..9405, 9406..9450, 9451..9495, 9496..9540, 9541..9585, 9586..9630, 9631..9675, 9676..9720, 9721..9765, 9766..9810, 9811..9855, 9856..9900, 9901..9945, 9946..9990, 9991..10035, 10036..10080, 10081..10125, 10126..10170, 10171..10215, 10216..10260, 10261..10305, 10306..10350, 10351..10395, 10396..10440, 10441..10485, 10486..10530, 10531..10575, 10576..10620, 10621..10665, 10666..10710, 10711..10755, 10756..10800