Solve for x and y:
2x+2.5=4000
4x+1y=4800
1x+0.75y=1500

Question

Solve for x and y:
2x+2.5=4000
4x+1y=4800
1x+0.75y=1500

anonymous · Answer

use the first equation to solve for x.
insert that value of x into the second and third equations. If the y values are not the same for equations 2 and 3, the system is inconsistent.

anonymous · Answer

Well, you can also solve by graphing or using matrices.

anonymous · Answer

ok but in matrices how would the equations be set up?

anonymous · Answer

oof, it's been a while.  I think the first matrix needs to be a 3 by 3.  The first column is your coefficients for x, second column is the coefficients for y and the third column can be your constants.  The other matrix needs to be 3 by 1 

Then you do the A inverse B to find your solutions.

Matrix A

2   0   2.5
4   1    0
1  .75   0

Matrix B

4000
4800
1500