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x=8/2
x=4
0x+3y=9
y=9/3
y=3
b) x+0=3
x=3
3+4y=11
4y=11-3
y=8/4
y=2
8a) AC=(4.5 3.5)
(2.2 -1.2)
=(20 15)
(4 -2)
BC=(1.5 2.5)
(3.2 4.2)
=(5 10)
(6 8 )
AC+BC=(20+5 15+10)
(4+6 -2+8)
=(25 25)
(10 6 )
AC-BC=(20-5 15-10)
(4-6 -2-8)
=(15 5)
(-2 -10)