Questions on Algebra: Systems of Linear Equations answered by real tutors!

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Question 580321: An airplane flew for 6 hours with a 22-km/h tail wind. the return flight against the same wind took 8 hours. find the speed of the plane in stil air. how do i set up this equation?
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Question 580339: I need help with solving 3x+y=-8 and -2x-y=6 by substitution.
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Question 580387: 5y=7x+22
x=-6y+17
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Question 580613: Solve the following simultaneous equations by using Cramer’s rule

3x+2y=13
2x-y=4
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Question 580629: im brandon, the question i have is for algebra A. Its solving systems using substitution, problem is Y=x-4 and 2x-5y=2 . can you explain how to do this .
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Question 580638: im brandon, i need help with substitution. problem is x-2y+2=0 and 2x-3y-2=0. i dont understand this one. please help?
Click here to see answer by Alan3354(30993)

Question 580926: how do i y=2x and x+y=12 by solving system of equations by the substitution method?
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Question 580973:
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Question 581111: could you show me how to do this problem 9-4m=19
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Question 581111: could you show me how to do this problem 9-4m=19
Click here to see answer by algebrahouse.com(1079)

Question 581128: I need help setting up this Linear Equation: While on vacation, Kevin went for a swim in a nearby lake. Swimming against the current, it took him 8 minutes to swim 200 meters. Swimming back to shore with the current took half as long. Find Kevin's average swimming speed and the speed of the lake's current.
Click here to see answer by dfrazzetto(277)

Question 581378: How do you write 2x+3y=30 in standard form with integer coefficients

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Question 580809: Determine whether the lines are parallel,perpendicular,neither,unknown or impossible to say.7x+2y=14;7y=2x-5

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Question 581506: through (2,-5), slope=-3/2
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Question 581554: y=3(X+5)(x-2) help me solve thanks
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Question 581618: Subject: Math-using addition to solve a system of linear equations
1. x+y=12
x-y=4
Click here to see answer by jim_thompson5910(28598)

Question 581785: IT took 3 hours to row a boat 18 km against the current. The return trip with the current took1 1/2 hours. Find the speed of the rowboat in still water.
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Question 582269: Please set this up as y=mx+b: Discount Cell Phones charges $19.99 per month and $0.15 per text message.....thank you
Click here to see answer by richard1234(5390)

Question 582251: write the equationof a line that goes through points -4, 3 and 3, 7 in oint-slope form
Click here to see answer by mananth(12270)

Question 582461: Please help me. I want to know if my answer is correct.
Which of the following is/are correct?
My answer is none are correct because the answers are not 1 over the square roots
A) if u = (u1, u2) with ui not equal to 0 for all 1 < or equal to i < or equal to 2... then the unit vector in the direction of u is (u1, u2)
B) if u = (1, 2, 3) then the unit vector in the same direction of u is (1, 2, 3)
Click here to see answer by solver91311(16897)

Question 582763: Hi!! Could you help me solve this linear system using elimination? Please?!
x+y=2
2x+7y=9
I tried to solve it myself, and I got (-.5,2.5) i checked the selected answers in the back of the book and found out the answer is (1,1). Could you help me sove this step by step please?!
THANK YOU!!!!
Click here to see answer by jim_thompson5910(28598)

Question 583015: x+7=15
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Question 583055: i need help please on my home work
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Question 583072: In an isosceles triangle, two of the angles are equal in measure. If the third angle is 21° less than three times the other angles, find the measure of all three angles.
Click here to see answer by Edwin McCravy(8912)

Question 583090: I have a project due tomorrow. I am to do this equation by substitution and elimination. Then graph the equation. I have done the substitution and elimination. Is there another way that I should do the linear equations to show for the graph?

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Question 583163: please help me with this problem I can't get past it! It needs to be solved using elimination and graphing method
x+y=152
x=y+28
Click here to see answer by Alan3354(30993)

Question 583172: A new parking lot has spaces for 450 cars. The ratio of full-sized cars to compact cars is 11 to 4. How many spaces are for full-sized cars? How many spaces are for compact cars?
Click here to see answer by spongetatle(6)

Question 583541: Select the best possible first step to solving the system by first eliminating the x variable
x – 12y = –2
3x + 4y = 18

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Question 583539: Select the best possible first step to solving the system by first eliminating the x variable
3x + 5y = 1
2x + 4y = –4
Click here to see answer by Alan3354(30993)

Question 583570: A biologist has a 30% solution and a 5% solution of the same plant nutrient. How many cubic centimeters (cc) of each solution should be mixed to obtain a 25 cc of a 25% solution? (Round your answers to 2 decimal places if needed)
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Question 583605: what are the steps for the following
9+x=4x-21
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Question 583654: solve the following by the elimination method 7x-4y=-30 and 3x+4y=10
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Question 583859: solve using the addition method
A) 2x-6y=-2
5x+y=27
B) 4x-2y=-6
3x+y=-7
C) -2y-x=2
y= -1/2x-1
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Question 584152: express the following statement as a linear equation in two variables BY TAKING PRESENT AGES(IN YEARS)OF FATHEr AND SON AS X AND Y.RESPECTIVELY.AGE OF FATHER 5 YEARS AGO WAS TWO YEARS MORE THAN 7 TIMES THE AGE OF HIS SON AT THAT TIME.
Click here to see answer by josmiceli(9697)

Question 584297: A given line has a slope -4/3 and passes through the point (-3, -6). Find the equation of the line in slope-intercept form.
Answers:
(A) y= -4/3x +2
(B) y= -4/3x - 6
(c) y= -4/3x + 12
(D)y= -4/3x - 10
(E) None of the above

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Question 584702: A father is 30 years older than his son, one year ago he was 4 times as old as his son, find their present ages?
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Question 584697: A tugboat can pull a boat 24 mi downstream in 2h.going upstream the tugboat can pull the same boat 16 mi in 2h. what is the speed of the tugboat in still water ? what is the speed of the current ?
how can use the formula d=rt to help you solve the problem?
how are the tugboat's speed when traveling upstream and downstream related to its speed in still water and the spend of the current?

Click here to see answer by mananth(12270)

Question 584990: 1/4(8y + 4) - 17 = -1/2(4y - 8) Would I clear out the fractions by four which is the lcm? 1(8y + 4) - 17 = - 2(4y - 8)
8 + 4 - 17 = -8y - 8
12-17= -16
- 5 = - 16??? I am so lost Can I have some help please?
Click here to see answer by rfer(12670)

Question 585058: how do you solve the inequality 1/3x is greater than or equal to 2
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Question 585286: Please help me solve this equation (step by step)
Using Elimination
x+y=1
-2x+y=4
Click here to see answer by mananth(12270)

Question 585504: what is the slope of a line perpendicular to a line with an equation 4x-2y=6
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Question 585565: x+y=20
30x+50y=880

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Question 585640: 2x +5y = 17
6x - 5y = -9
Click here to see answer by jim_thompson5910(28598)

Question 585738: okay im really behind in my math i dont get it at all so i really need your help with my work.if you could solve this problem and email it to me i would like it alot.also try to show me how you did it..

solve this system of equations using the the addition method x-y=6 and -3y=xt22
Click here to see answer by mananth(12270)

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