If 2x + 1y + 1z = 8.25 and 1x + 1y + 2z = 7.25 then what is x equal to

Question

2x + 1y + 1z = 8.25

1x + 1y + 2z = 7.25

i need to solve for x

Answer 1

Subtract the second equation from the first.  This will eliminate the y terms, since the coefficients are the same.

 

x - z = 1

 

 

You know what to do from here.