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From Mathematics: General-Mathematics
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Due on Dec. 12, 2008
Asked on Dec. 13, 2008 at 12:39:32AM

Q:
1. solve by the substitution method, 3x-3y=-24, 5x+56=y
2. solve by the substitution method, 2m+n=15, m-6n=27
3. solve by the substitution method, 2x+6y=14, -7x+y=39
4. solve by the substitution method, 2x+9y=56, -2x+y=24
5. solve by the elimanation mathod, x+5y=30, -x+4y=15
6. solve by the elimanation mathod, 5x+5y=-7, 7x-2y=13
7. solve by the elimanation mathod, 0.3x-0.2y=4, 0.2x+0.5y=21/23
8. solve by the elimanation mathod, 4x-9y=6.5, 7y-2x=-4.5
9. solve by the elimanation mathod, 0.05x+0.25y=44, 0.15x+0.05y=48

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malaya
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Posted on Dec. 13, 2008 at 01:07:31AM

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Preview: ... 3. solve by the substitution method, 2x+6y=14, -7x+y=39 (-5,4) 4. solve by the substitution method, 2x+9y=56, -2x+y=24 (-8 ...

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bibhupada
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Posted on Dec. 13, 2008 at 02:58:05AM

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Preview: ... e get x-y=-8 (eqn1) or x=y-8 putting the above value of x in the second eqn,that is 5x+56=y we get 5(y-8)+56=y so 5y-40+56-y=0 so 4y +16=0 4y=-16 so y= -4 so x=y-8=-4-8=-12 so (x,y)=(-12,-4) 2) 2m+n=15 (eqn1) m-6n=27 (eqn2) from eqn(1) n=15-2m putting the value of n in eqn(2) we get m-6(15-2m)=27 so m-90 +12m-27=0 so 13m-117=0 so 13m=117 so m=117/13 =9 so n=15-2m=15-(2*9) =15-18 =-3 so(m,n)=(9,-3) 3) 2x+6y=14 dividing by 2 we get x+3y=7 (eqn1) -7x+y ...

The full tutorial is about 512 words long .