唔識，點算啊！救命啊！

當 x=2時 ,y=y = 2(2)+3(2)-1

y= 2(2)+3(2)-1

y= 2 x 2 + (3 x 2) -1

y=4 + 6 - 1

y=9

有錯請指教

照計!
y=2*2+3*2-1
y=4+6-1
y=10-1
y=9
查實x=?也can't影響y
so I其實唔係好明你talk what!