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3x-2y=16 x2
2x+5y=-2 x3
6x-4y=32
6x+15y=-6 -
-19y=38
y= 38/-19 = -2
3x-2y= 16
3x-2.-2=16
3x+4=16
3x=16-4
3x=12
x=12/3= 4
***5x+3y = 5.4+3.-2= 20+-6= 14 (b)
21.keliling p.panjang :
2(p+L)=40
p+p+l+l=40
p+p+(p-4)+(p-4)=40
4p-8=40
4p=40+8
4p=48
p=48/4=12
p= 12
l= 12-4=8
luasnya : 12x8= 96 (c)