Tutors Answer Your Questions about Systems-of-equations (FREE)
Question 112620: I really need some help!!!! Please!
Solve this system of equation using either addition or substitution method.
George has two investments that yield a total of 185.60 in annual interest. The amount onvested at 8% is 320$ less than twice the amount invested at 6%. How much is invested at each rate.
Amount invested at 8% _____________
Amount invested at 6% _____________
Click here to see answer by scott8148(6628)   |
Question 113156: Having a real hard time with this...please help!
Solve system of equation word problem but either addition method or substitution method.
George has two investments that yield a total of $185.60 in annual interest. The amount invested at 8% is $320 less than twice the amount invested at 6%. How much is invested at each rate?
Amount invested at 8% _________
Amount invested at 6% _________
Click here to see answer by SHUgrad05(58) |
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(19441)  |
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(22740)  |
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
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-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(75887) |
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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, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400
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