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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 583015: x+7=15
Click here to see answer by JBarnum(2146)

Question 583055: i need help please on my home work
Click here to see answer by nyc_function(2741)

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(20056)

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?

Click here to see answer by solver91311(24713)

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(69443)

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

Click here to see answer by mananth(16946)

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(69443)

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)
Click here to see answer by nerdybill(7384)

Question 583605: what are the steps for the following
9+x=4x-21
Click here to see answer by JBarnum(2146)

Question 583654: solve the following by the elimination method 7x-4y=-30 and 3x+4y=10
Click here to see answer by Maths68(1474)

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
Click here to see answer by solver91311(24713)

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(19441)

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

Click here to see answer by solver91311(24713)

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?
Click here to see answer by mananth(16946)

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(16946)

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(16322)

Question 585058: how do you solve the inequality 1/3x is greater than or equal to 2
Click here to see answer by Alan3354(69443)

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(16946)

Question 585504: what is the slope of a line perpendicular to a line with an equation 4x-2y=6
Click here to see answer by Alan3354(69443)

Question 585565: x+y=20
30x+50y=880

Click here to see answer by mananth(16946)

Question 585640: 2x +5y = 17
6x - 5y = -9
Click here to see answer by jim_thompson5910(35256)

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(16946)

Question 586168: What is the first line of the equation for:
-3x+2y=-6
-2x+y=6
The answer is (-18,-30) I just don't know how to write out the problem.
Click here to see answer by rfer(16322)

Question 586337: i am 600 miles away from home traveling at 65 mph and i need an equation to find out when ill be 300 miles away from home. is y=65x+600 a good equation?

Click here to see answer by Alan3354(69443)

Question 586442: what is 4(x+7)=7+x??
Click here to see answer by josmiceli(19441)

Question 586625: How do I find out if 2x-9y=23 is linear
Click here to see answer by solver91311(24713)

Question 586639: two positive integers are in the ratio 2 to 5 if both numbers are decrease by 5 the new ratio is 1:4 find the original numbers.
Click here to see answer by solver91311(24713)

Question 586667: 1: twice the numerator of a fraction exceeds the denominator by 2. if 1 is added to both the numerator and the denominator, the resulting fraction is equal to 2/3. find the orginal fraction
Click here to see answer by ankor@dixie-net.com(22740)

Question 586938: I need to find the ordered pair of the x intercept. the problem is;
y=x^2-2x-3
Click here to see answer by richwmiller(17219)

Question 587193: The point (3, 2) lies on the line 11x � 6y = 21. Determine if this point is a solution of the system
11x � 6y = 21
9x + 8y = 43

Click here to see answer by josmiceli(19441)

Question 587803: 9x = 7x + 10
Click here to see answer by Alan3354(69443)

Question 587895: How do I work the equation:
What is the slope of the line whose equation is y=2x+7?
I am confused as to how I work the process step by step.
Thanking you for your assistance.
Click here to see answer by mananth(16946)

Question 588053: Use row of operations to solve x+y+z=-5, x-y+3z=-1, 4x+y+z=-2

Click here to see answer by Edwin McCravy(20056)

Question 588068: 15y+5/-21y-7
The slash is the fraction line. In the textbook it looks like this:
15y+5
------
-21y-7
Click here to see answer by Edwin McCravy(20056)

Question 588103: I am trying to write and solve a system of equation. THe question is 3 large popcorns and 2 small drinks cost $21.00 and another customer bought 2 large popcorns and 4 small drinks for $22.00. Find the cost of a large popcorn and the cost of a small drink.
Click here to see answer by stanbon(75887)

Question 588391: What is the solution of the following system of equations?

The choices are:
1. (0,-4)
2. (-4,0)
3. (-4,-3) and (0,5)
4. (-3,-4) and (5,0)
I saw that these equations both equal y so I set them equal to eachother. But then I got lost after putting them together. I don't know what I am finding.
Thanks!
Click here to see answer by oscargut(2103)

Question 588781: x+y=-7
3x+y=-9
Click here to see answer by littlealice(2)

Question 588967: what is the x and y intercept for x-y=-3
Click here to see answer by jim_thompson5910(35256)

Question 589242: i need to know how many solutions the system has.
x^2+y^2=4 and y=x-1
Click here to see answer by richwmiller(17219)

Question 589483: i am doing solving systems by elimination and i don't understand how to the problem. it is 3x-y=-2 and -2x+2y=8
Click here to see answer by richwmiller(17219)

Question 589501: in math im doing solving systems by elimination and one of the problems have three equations in the system. does that change the process you use or is it the same just with three equation?
Click here to see answer by richwmiller(17219)

Question 589783: Suppose that f is a linear function with slope 2.4 and that f(7)=-3. What value of x gives f(x)=0? Thanks!
Click here to see answer by John10(297)

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