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16 4 x + 3 y = 18 {\displaystyle 4x+3y=18} (给定 y = 2 {\displaystyle y=2} )
17 2 x y + 1 + 4 = 20 {\displaystyle {\frac {2x}{y+1}}+4=20} (给定 y = 3 {\displaystyle y=3} )
18 2 ( 2 x − 2 y − 3 ) + 8 = 6 2 {\displaystyle 2\left({\frac {2x-2}{y-3}}\right)+8=6^{2}} (给定 y = 7 {\displaystyle y=7} )
19 3 3 + 2 0 + 3 x − 2 y ( 18 2 ) = 97 {\displaystyle 3^{3}+2^{0}+3x-2y\left({\frac {18}{2}}\right)=97} (给定 y = 3 {\displaystyle y=3} )
20 [ 5 ( 2 x − 3 ) ] 2 = y + 6 {\displaystyle [5(2x-3)]^{2}=y+6} (给定 y = 19 {\displaystyle y=19} )