$0.80x + y = 110\\
1.2x + 1.6y = 168\\
\\
y = 110 - 0.80x\\
1.2x + 1.6y = 168\\
\\
1.2x + 1.6(110 - 0.80x) = 168\\
1.2x + 176 - 1.28x = 168\\
-0.08x = 168 - 176\\
0.08x = 176 - 168\\
0.08x = 8\\
x = 100\\
\\
y = 110 - 0.80 * 100 = 110 - 8 = 102$