Please help stuck on solving a system with three equations

Question

0.5a + 0.3b=2.2..
1.2c-8.5b=-24.4..
3.3c+1.3a=29

Answer 1

First:  multiply all equations by 10.

 

  5a + 3b = 22

12c + 85b = -244

33c + 13a = 290

 

Eliminate b from the first 2 equations, getting an equation in a and c.

 

Use that and the 3rd equation to solve for a and c. 

 

Finally, use these numbers to solve for b.

 

I hope this helps.