Tutors Answer Your Questions about Systems-of-equations (FREE)
Question 114043: Solve this system of equations.
x+y+z= -1
2x+4y+2z= -2
-x+6y-3z= -21
Write the solution as an ordered triple.
(Type an exact answer in simplified form. If the solution is the empty set, type N for each coordinate. If there are infinitely many solutions, type I for each coordinate.)
Click here to see answer by josmiceli(9698)   |
Question 114038:
soybean meal is 18% protein; cornmeal is 9% protein. How many pounds of each should be mixed together in order to get 360lbs mixture that is 17% protein?
How many pounds of the cornmeal should be in the mixture?
How many pounds of the soymeal should be in the mixture?
Click here to see answer by checkley71(8403) |
Question 114012: soybean meal is 18% protein; cornmeal is 9% protein. How many pounds of each should be mixed together in order to get 360lbs mixture that is 17% protein?
How many pounds of the cornmeal should be in the mixture?
How many pounds of the soymeal should be in the mixture?
Click here to see answer by checkley71(8403) |
Question 114016: Solve this system of equations.
x+ y+ z= 1
2x+y+2z= -2
-x+y-3z= -21
Write the solution as an ordered triple.
( )
(Type an exact answer in simplified form. If the solution is the empty set, type N for each coordinate. If there are infinitely many solutions, type I for each coordinate.)
Click here to see answer by ankor@dixie-net.com(15667)  |
Question 115431: we have been studying systems of nonlinear equations in two variables.
Question:
Solve: x^2-y^2=1 and x^2+y=7
I started by isolating the y variable on the 2nd problem
y=7-x^2
Then I know I need to use addition or substitution method to solve:
I picked substitution method.
x^2-(7-x^2)^2=1
x^2 -(49-14x^2+x^4)=1
x^2-49+14x^2-x^4=1 changed signs because of negative sign.
-x^4+15x^2-49=1 combined like terms
-1 -1
--------
-x^4+15x^2-50=0
0=x^4-15x^2+50 rewrite for better understanding
A=x^2 Use this in replacement of x^2
0=A^2-15A+50
(A-10) (A-5) Factor
A=10 A=5
Now I place x^2 back in for A
x^2=10 x^2=5
This is where I get lost, I know on old problems I would use my radicand/square root symbol
over each and x would equal a square root ie: x^2=1 x^2=9
x= +/-1 x= +/-3
and my answers were: (1,3) (3,1)
(-1,-3) (-3,-1)
Please help me finish this problem:) It's been 2 days trying to figure out what I'm doing wrong.
Click here to see answer by vertciel(183) |
Question 117338: Is it possible to get the hypotenuse of a right angle when only knowing the length of one side of the angle. I have a right angle which has the base of 35mm
and I do not know the other side or the hypotenuse, What is the formula and/or the hypotenuse of the other side.
Click here to see answer by stanbon(57424) |
Question 117546:
1. Nicole sells gift wrap for 4.00 per package and greeting cards for 10.00 per
package. Nicole seels 205 packages in all and recieves a total of 1084. How many pagkagers of gift wrap did she sell?
2. How would you set this equation up?
Click here to see answer by scott8148(6628)  |
Question 117546:
1. Nicole sells gift wrap for 4.00 per package and greeting cards for 10.00 per
package. Nicole seels 205 packages in all and recieves a total of 1084. How many pagkagers of gift wrap did she sell?
2. How would you set this equation up?
Click here to see answer by checkley71(8403) |
Question 118184: Hi, I am trying to review for a final and am stuck on this one.
Use method of substitution to solve system:
x-y^3=1
2x=9y^2+2
This is what I have done:
x=1+y^3
2(1+y^3)= 9y^2+2
2+2y^3=9y^2+2
2y^3=9y^2+2
2y^3-9y^2=0
y(y+3)(y-3)
Click here to see answer by stanbon(57424) |
Question 118189: This is an application that falls under this category. I have worked it to the end but need a little guidance.
An airline that flies from LA to Albuquerque with a stopover in Phoenix charges a fare of $45 to Pheonix and a fare of $60 from LA to Albuq. A total of 185 passengers boarded the plane in LA and fares totaled $10,500. How many passengers got off of the plane in Pheonix?
This is how I sat the problem up:
x+y= 185
45x+60y= 10,500
I know this problem should be solved using elimination.
So I mult E1 by -45 in order to eliminate.
-45(x+y)= 185
-45x-45y= 185
45x+60y= 10,500
With this I end up with..
15y=10,685
then I divided by 15 but got a decimal...am I doing this right?
Click here to see answer by scott8148(6628) |
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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
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