Question 1008285
Solve each system by elimination. 
1) 10x - 8y = 16
   20x - y = 2
---
Modify for elimination::
20x - 16y = 2*16
20x -   y =  2
---
Subtract and solve for "y":
15y = -30
y = -2
---
Solve for "x"::
10x = 8y + 16
10x = -16 + 16
x = 0
----------- 

2) -2x + 5y = 29
   -2x + 2y = 20 
----
Subract and solve for "y"::
3y = 9
y = 3
Solve for "x":
2x = 5y-29
2x = 15-29
2x = -14
x = -7
------------
Cheers,
Stan H.
------------