SOLUTION: Please help! im so confused! I have tried by substitution and elimination but i just cant get it!!! 2. t+m=2.1 2t+3m=5.15 3. 4o+5a=2.00 3o+4a=1.56 7. 2l+2w=160 2

Question 126789: Please help! im so confused! I have tried by substitution and elimination but i just cant get it!!!
2. t+m=2.1
2t+3m=5.15
3. 4o+5a=2.00
3o+4a=1.56
7. 2l+2w=160
2.5r+8b=137
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
Problem 2.
Eq. 1
Eq. 2
Multiply Eq. 1 by -2. That gives you -2t in Eq. 1 and 2t in Eq. 2
Eq. 1
Eq. 2
Now add the two equations

Now you can proceed either one of two ways. Either substitute the .95 value you got for m back into Eq. 1 ( => ), or you can start with the original 2 equations and multiply Eq. 1 by -3 so that the addition step will eliminate m.

Eq. 1
Eq. 2
========================

Same result.

Problem 3.
Do this one the same way, except that you need to be a little more creative in finding the multipliers for the equations.
Eq. 1
Eq. 2

Multiply Eq. 1 by 3 and Eq. 2 by -4. That gives you in Eq. 1 and in Eq. 2. Then proceed as in the first problem.

Problem 7. There is no effective solution method for this system because you have 4 different variables and only 2 equations.
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