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

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Algebra: Expressions involving variables, substitution

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Question 123547: Solve the system by substitution.
x + 2y = –17
–2x + 3y = –15
Solve the system by addition.
–2x + 5y = –19
x – 3y = 10

Click here to see answer by rajagopalan(125)

Question 123647: Please help me solve this equation:
2(x-6)+8=4(x+2)-6
Solution x=
Click here to see answer by stanbon(26259)

Question 123646: Please help me solve this equation:
3(x+4)=5(x-2)
x=
Click here to see answer by nadinadan(32)

Question 123646: Please help me solve this equation:
3(x+4)=5(x-2)
x=
Click here to see answer by Earlsdon(4898)

Question 123645: Please help me solve this equation:
4(2x-2)=32
Click here to see answer by nadinadan(32)

Question 123641: Can someone help me solve this problem, please?
20x^3-28x^2+45x-63 Factor by grouping.
Thank you.
Click here to see answer by nadinadan(32)

Question 123641: Can someone help me solve this problem, please?
20x^3-28x^2+45x-63 Factor by grouping.
Thank you.
Click here to see answer by edjones(3292)

Question 123667This question is from textbook Structure and Method Book 1

: Simplify by dividing
x^3+2x+3x-6/x-1
n^3-27/n-3

This question is from textbook Structure and Method Book 1

Click here to see answer by praseenakos@yahoo.com(417)

Question 123668This question is from textbook Structure and Method Book 1

: Simplify by dividing
x^3+2x+3x-6/x-1
n^3-27/n-3

This question is from textbook Structure and Method Book 1

Click here to see answer by praseenakos@yahoo.com(417)

Question 123666This question is from textbook Structure and Method Book 1

: Add or subtract as indicated
b+b-1

2b+b^2-1
a-1+a+1
a+1+a-1
4-a-5
1-5-aThis question is from textbook Structure and Method Book 1

Click here to see answer by praseenakos@yahoo.com(417)

Question 123703: Please help solve this equation:
b^2-3b+2
Click here to see answer by praseenakos@yahoo.com(417)

Question 123720: Please help me solve this equation:

Click here to see answer by nadinadan(32)

Question 123720: Please help me solve this equation:

Click here to see answer by sujanag(3)

Question 123735: Problem Solving: How to solve:
A factory employs skilled laborers at $25 per hour and unskilled at $12 per hour. The hourly cost of the factory's 24 workers is $405. How many of each type of laborer works at the factory?
s-skilled
u-unskilled
Click here to see answer by checkley71(8405)

Question 123758: Problem Solving: How to solve:
Supppose you have 10 coins that total $0.85. Some coins are dimes and others are nickels. How many of each do you have???? Using elimination
Click here to see answer by checkley71(8405)

Question 123757: Problem Solving: How to solve:
Supppose you have 10 coins that total $0.85. Some coins are dimes and others are nickels. How many of each do you have????
Click here to see answer by brina_math(3)

Question 123749: Please help me solve this equation:
6(r-8)+5>7(r+2)-22
Click here to see answer by brina_math(3)

Question 123744: Please help me solve this equation:
8(4x-2)=112
Click here to see answer by brina_math(3)

Question 123754:
Solve the system of equations given by y = 2x + 2 and y =1/3x - 5
Click here to see answer by checkley71(8405)

Question 123743:

Please help me solve this equation:Solve using addition and multiplication.
6-6x<4-5x
Click here to see answer by checkley71(8405)

Question 123813: Problem Solving With Systems of A line: How to Solve
Suppose you have 10 coins that total $0.85. Some of the coins are dimes, and others are nickels. How many of each coin is thers?
Click here to see answer by checkley71(8405)

Question 123811: Problem Solving With Systems of A line: How to Solve
The difference of the measures of two supplementary angles is 35*. Find both angle measures. The sum they add up to is 180*.
Click here to see answer by bucky(1732)

Question 124193: Please simplify and solve:
(-x-y) + (x^2 + y^2)/(x-y)
Click here to see answer by chitra(359)

Question 124242: Solve by substitution or elimination:
x=3y+11
2x+5y=0
I dont understand could I please have help for this question?

Click here to see answer by Fombitz(2113)

Question 124242: Solve by substitution or elimination:
x=3y+11
2x+5y=0
I dont understand could I please have help for this question?

Click here to see answer by solver91311(5072)

Question 124231: Please help me solve!
Give the general term of the set. Type the general term using n.
{7, 10,13, 16, 19, ......}

Click here to see answer by solver91311(5072)

Question 124103: sorry i cant figure this out
if sylvia works overtime she is paid 1 1/2 times as much per hour as usual. after working her usual 40 h last week. she worked and additional 4h overtime. if she made $552 last week find her usual hourly wage

THANSK ALOT
Click here to see answer by ankor@dixie-net.com(6691)

Question 124252: Can someone please help me with this problem?
Solve the system by addition.
–2x + 5y = –19
x – 3y = 10

Click here to see answer by solver91311(5072)

Question 124104: i cant figure this one out
how many liters of water must be evaporated from 10L of 40% salt solution to produce a 50% solution

THANKs ALOT
Click here to see answer by ankor@dixie-net.com(6691)

Question 124190: This is another one that has me stumped.
Please solve:
1+(a/b) / 1-(a^2/b^2)
Thanx for your help!
Click here to see answer by MathLover1(1183)

Question 124188: Please help:
Solve for y and answer
2/3(y+2) - 5/6(y-1) = 5/4(y-3) - 4

Click here to see answer by MathLover1(1183)

Question 124307: Simplify the expression. (8^8)^3
I am confused by the multiple exponents. I'm sorry and I appreciate your help!
Click here to see answer by applesrbest(7)

Question 124336: The Cassini spacecraft mission to Saturn will take more than 61/2 years to reach Saturn. During its mission it will have traveled 2 billion miles in 80.5 months. Find the average speed in miles per hour. Convert 80.5 months to hours then use the formula d=rt.

So far I have:
Hours in a month=730.5 * 80.5 mo.=58805.25t
2,000,000,000d
58805.25t
?=r

Click here to see answer by ankor@dixie-net.com(6691)

Question 124390This question is from textbook Structure and Method Book 1

: 2x^2-32/x-4This question is from textbook Structure and Method Book 1

Click here to see answer by MathLover1(1183)

Question 124394This question is from textbook Structure and Method Book 1

: x^2+5x+4/(x+3)^2 Divide by x+1/x^2-9This question is from textbook Structure and Method Book 1

Click here to see answer by MathLover1(1183)

Question 124392This question is from textbook Structure and Method Book 1

: x^2-9/x+2*x^2-4/x-3This question is from textbook Structure and Method Book 1

Click here to see answer by MathLover1(1183)

Question 124391This question is from textbook Structure and Method Book 1

: x-3/2^3*1/x-3^2
This question is from textbook Structure and Method Book 1

Click here to see answer by MathLover1(1183)

Question 124359: Solve, please.

1/4 + 1/x = 1/5 - 3/x

Thanks.
Click here to see answer by checkley71(8405)

Question 124487:
prove that a number and its cube leave the same remainder when divided by 6.
Click here to see answer by checkley71(8405)

Question 124513:
3x + 5y - (3y x 7) simplify expression
Click here to see answer by checkley71(8405)

Question 124523: 3(12b + 6c) - 7(4b - 5c) simplify expression
Click here to see answer by checkley71(8405)

Question 124613: 15c(12 - 8b) + 11b(9 +7c) simplify expression. I tried to do 15 x 12 and get 180c. I also did the same with 11 x 9 and got 99b, but I don't get how to do the rest.
Click here to see answer by stanbon(26259)

Question 124663: Please help me figure out the value of y.
Problem:
3y + 2 < 7 - 2y
Click here to see answer by jim_thompson5910(13787)

Question 124553: A dealer mixed some coffee worth $.80 per pound with coffee worth $.50 per pound to make a mixture to be sold for $.70 per pound. If the number of pounds of $.80 coffee was 10 more than the number of ponds of the $.50 coffee how many pounds of each kind did he use?
Click here to see answer by ankor@dixie-net.com(6691)

Question 124742: Please solve:

2/2-x + 3/x+2 = 2x/x^2 - 4

Thanks in advance!
Click here to see answer by dolly(163)

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