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 117199: I forgot to bring my book home and only have the problem written down.
Maragaret and Sylvia leave the house at the same time traveling in opposite directions. Margaret travels 30mph faster than sylvia. After 2 hours they are 200 miles apart. How fast is each woman traveling?
Click here to see answer by checkley71(8405)

Question 117242: Actually, I'm not sure what section this is in, but I really need help! Please, if you could help me, I need to solve the following equation:
4x+6y=3
2x+3y=-2
Click here to see answer by jim_thompson5910(13787)

Question 117246: 2divided by 5
-
y divided by y-2
Click here to see answer by edjones(3292)

Question 117537: Here is the problem, my son has (x-2)(x+3) they asked for him to multiply completely
Dad
Click here to see answer by stanbon(26259)

Question 117537: Here is the problem, my son has (x-2)(x+3) they asked for him to multiply completely
Dad
Click here to see answer by jim_thompson5910(13787)

Question 117561: Solve for X
(x – 4)/2 – 1/5 = (7x + 1)/20
Click here to see answer by jim_thompson5910(13787)

Question 117563: Solve for X
4(x – 1) + 2 = 3x + 8 – 2x
Click here to see answer by jim_thompson5910(13787)

Question 117564: Combine like terms
3x – 6x2 + 2 – 4x2 + 7x – 1 – 8 + 3x2
Click here to see answer by jim_thompson5910(13787)

Question 117562: Translate to an algebra statement; do not solve:
Three times the sum of a number and seven yields the same result as the twice the same number decreased by four.

Click here to see answer by jim_thompson5910(13787)

Question 117577This question is from textbook
: how can i do this:
x-y+z=0
3x-2y+6z=9
-x+y-2z=21This question is from textbook

Click here to see answer by MathLover1(1183)

Question 117847: i need help with a math problem i need it to be solved
the problem is (40-2x)(17-2x) i know that the answer is 222 but i don't know how that is possible
Click here to see answer by stanbon(26259)

Question 117915: show the equations or inequalities using variables.
3 times a number, increased by 7, is 19. find the number.
thanks
Click here to see answer by MathLover1(1183)

Question 117869: Help.Simplify: (1/a + 1/b) squared +(1/a + 1/b) squared
Click here to see answer by jim_thompson5910(13787)

Question 117400:
2a3 35ab
---- x -------
15b 8a5
Click here to see answer by checkley71(8405)

Question 118265: If A SKI RACER TRAVELS 2.03 MILES IN 2 MINUTES AND 57 SECONDS. WHAT IS HIS AVERAGE SPEED?
Click here to see answer by checkley71(8405)

Question 118265: If A SKI RACER TRAVELS 2.03 MILES IN 2 MINUTES AND 57 SECONDS. WHAT IS HIS AVERAGE SPEED?
Click here to see answer by misscrt(37)

Question 118265: If A SKI RACER TRAVELS 2.03 MILES IN 2 MINUTES AND 57 SECONDS. WHAT IS HIS AVERAGE SPEED?
Click here to see answer by stanbon(26259)

Question 118265: If A SKI RACER TRAVELS 2.03 MILES IN 2 MINUTES AND 57 SECONDS. WHAT IS HIS AVERAGE SPEED?
Click here to see answer by guadalupeh_14(1)

Question 118279: A company manufatures an alarm clock.3 weeks ago the company had 250 on hand 2 weeks from now the company will have 500.Assume the company will continue to make the clocks at the same rate. To writ the expresson,define a variable for the time in weeks from today and use this variable to writ a rule for the number of clocks manufactured.I have used so many different ways to write this and even went threw a math tutor site that gave me an answer that it wouldn't take.250=(50)(-3)+b 250=(50)(-3)+400 500=(50)2+400 we just can't figure out what it wants for the expression.
Click here to see answer by stanbon(26259)

Question 118307: 3.3 #63
draw the graph of each line using its y-intercept and its slope.
4y + x = 8

Thank you
Click here to see answer by tutorcecilia(2042)

Question 118308: #67 in each case determine whether the lines are parallel, perpendicular or neither.
y=3x-4
y=3x-9
thank you
Click here to see answer by tutorcecilia(2042)

Question 118305This question is from textbook elementary and intermediate algebra
: use the given equations to find the missing coordinates in the following table

y= -2x+5
table
x y
-2
0
2
-3
-7
Thank youThis question is from textbook elementary and intermediate algebra

Click here to see answer by MathLover1(1183)

Question 118389: How do I solve this equation : 50=30x*10
Click here to see answer by tutorcecilia(2042)

Question 118409: -4(2.5x+8.7)=(1.4-9.2x)(6)
Click here to see answer by tutor_paul(424)

Question 118570: Need work for problem 5x-3=13-3
Click here to see answer by jim_thompson5910(13787)

Question 118576: x=-4y
3x+2y=20
Click here to see answer by jim_thompson5910(13787)

Question 118572: y=4x
x+y=5
Click here to see answer by jim_thompson5910(13787)

Question 118619: Stasi claims: "It is possible to have 46 coins consisting of pennies and nickels totaling exactly one dollar. Is she right or wrong? How?
Click here to see answer by ankor@dixie-net.com(6691)

Question 118620: Amber has 1/2 as much money as Jackie. Amber has $6.00 less than Alexandra. Together they have $54.00. How much money does each young lady possess?
Click here to see answer by stanbon(26259)

Question 118617: Kyle has 50 coins consistin of nickels and dimes. If he has $4.15, how many of each coin does Kyle possess?
Click here to see answer by stanbon(26259)

Question 118616: Walnuts cost $.20 per pound more than peanuts. If Teal paid $5.10 for 4 pounds of peanuts and 6 pounds of walnuts, what did she pay per pound for each?
Click here to see answer by stanbon(26259)

Question 118677: How do you write an equation for the line (in slope-intercept form) with the given information:
1.is vertical and passes through (4, 11)
2.passs thrugh (7, -10) and (4, -16)
3.passes through (2, 18) and (4, 17)

(P.s. they are seperate problems 123)
Click here to see answer by jim_thompson5910(13787)

Question 118705This question is from textbook Algebra 1
: Simplify the expression (-7)+6+[-(2-3)]

This question is from textbook Algebra 1

Click here to see answer by checkley71(8405)

Question 118705This question is from textbook Algebra 1
: Simplify the expression (-7)+6+[-(2-3)]

This question is from textbook Algebra 1

Click here to see answer by m.hansen(16)

Question 118703: the area of Lake Superior is about 4 times the area of Lake Ontario.The area of Lake superior is 78,114 km squared.what is the area of lake ontario?
Click here to see answer by checkley71(8405)

Question 118722: what is the slope of the line x= -2
Click here to see answer by checkley71(8405)

Question 118739: what are the x and y- intercept of the line -12x+6y=12
Click here to see answer by jim_thompson5910(13787)

Question 118749: write the equation of the line which contains (-3,1) and whose y intercept is -8
Click here to see answer by jim_thompson5910(13787)

Question 118753: Rewrite the equation in slope-intercept form. 5x-2y-7=0
Click here to see answer by jim_thompson5910(13787)

Question 118753: Rewrite the equation in slope-intercept form. 5x-2y-7=0
Click here to see answer by misscrt(37)

Question 118757: what is the slope and y intercept for the line -10x-5y+20=0
Click here to see answer by jim_thompson5910(13787)

Question 118778: the distance traveled (D) equals the rate of travel (r) times the time traveled (t). how long would it take a boat traveling 50 miles per hour to travel 325 miles,assuming there are no stops?
Click here to see answer by bucky(1732)

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