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3x-2y=5
6x+9y=36
6x-4y=10
_______ _
13y = 26
y = 2
3x-2y =5
3x-2•2=5
3x-4 = 5
3x = 5+4
3x = 9
x = 3
--------------------------------
ax+by=16
ax-by=8
3a+2b=16
3a-2b=8
________ _
4b = 8
b = 2
3a-2b=8
3a-2•2=8
3a-4=8
3a = 8+4
3a = 12
a = 4
a - b = 4 - 2 = 2