Tutors Answer Your Questions about Linear-equations (FREE)
Question 129875: Solve the system of equations using the substitution method.
If the answer is a unique solution, present it as an ordered pair: (x, y). If not, specify whether the answer is “no solution” or “infinitely many solutions.”
-7x + y = 4
2x + 8y = 0
Click here to see answer by scott8148(6628)   |
Question 130011: Well, I have a test prep to do and chap. 7.1 review and this question stumps me and I can't figure out how to put the equations in an appropriate form so I can graph it. Because like I know I have to put it in the y=mx+b form but the equation will have a fraction slope and I don't get that particular part. So can you please help me.
Click here to see answer by solver91311(24713)  |
Question 130054:
Write an equation of the line containing the specified point and parallel to the indicatd line. (-2,-3), 2x+3y=-7
Please do this step by step, becuase I have had 3 people try and explain it to me and I still don't get it.
Click here to see answer by checkley71(8403) |
Question 129703: I need some help creating this linear equation. Help Please!
By the time and infant boy is one year old, he will weigh approximately two and a half time the amount he weighed at birth. Baby Jim weighed 8.4 pounds when he was born.
Write a linear equation that gives Jim's weight, w, in terms of his age, a, where a is measured in months. (Hint: There are two odered pairs, (a,w), indicated in the opening paragraph).
Click here to see answer by scott8148(6628) |
Question 130138: Write a system of two linear equations with infinitely many solutions for the following.
A quantity of 13% acid solution is being diluted with some 3% acid solution. The final solution must be 8% acid and contain 90 mL. How much of each solution must be added to accomplish this?
a.) Write a system of equations that describes the situation.
b.) Solve the system.
Click here to see answer by checkley71(8403) |
Question 130965: Bob has $40 to spend on popcorn and pop. The equation 5x + 2y=40 describes the number of popcorns x and small drinks y she can buy. Graph this function and find its intercepts. The graph is set up with numbers 2-20 on each axis.
Click here to see answer by checkley71(8403) |
Question 130965: Bob has $40 to spend on popcorn and pop. The equation 5x + 2y=40 describes the number of popcorns x and small drinks y she can buy. Graph this function and find its intercepts. The graph is set up with numbers 2-20 on each axis.
Click here to see answer by stanbon(75887) |
Question 131020: I am having problems with the following:
The solutions of line "a" are (3,3) (5,5)
The solutions of line "b" are (3,-3) (5,-5)
a. Form the equations of both the lines.
b. What are the Co-ordinates of the point of the intersection of lines a and b.
Please use the slope formula and the point slope equation to answer "a"
I think the co-ordiantes is "0". I just can't do the "a" portion. Can somebody help?
Click here to see answer by checkley71(8403) |
Question 131019: Can you help me with this word problem?
The function f(x) = 2x2 +22x + 320 models the number of inmates in federal and state prisons in the United States [ f (x), in thousands], x years after 1980. Find and interpret f(14).
To start is this right?
4 + 22x + 320 = 22x + 324
-22 -22
x = 312
Click here to see answer by checkley71(8403) |
Question 131057: I am having problems setting up and solving the following word problem, can you help?
1. An art dealer sold 2 artworks for $1520 thereby making a profit of 25% on the first work and 10% on the other, whereas if he had approached any exhibition he would have sold them together for $1535 with a profit of 10% on the first and 25% on the other art work. Find the actual cost of each artwork.
Click here to see answer by stanbon(75887) |
Question 131001: Please help me with this problem I have tried three times and I just cant come up with whAT to do.
An administrator of a popular web site is told that a new server can handle 11,000 "hits" (users accessing the site) per second. The web site currently experiences a peak demand of about 85,000 hits per second; but every month, the peak demand increases by 3500 hits per second. Use a proportion equation to determine how many new servers the administrator should buy to address expected traffic for the next 18 months.
Click here to see answer by fners(16) |
Question 130999: Please help with the following problems I have tried and I juat can't get the problem.
A new virus is released on the internet; the administrator of a department's Local Area Network ( LAN) is given five minutes by a manager to estimate the impact. The administrator samples 12 of the PCs connected to the LAN, and finds that 7 are infected; use proportion to estimate the number of infected PCs if there are a total of 117 PCs connected to the LAN.
Click here to see answer by fners(16) |
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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, 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