bantuin dong teman teman no 2 dan 3

2.

a.
x+4=6
x = 6-4
x = 2 cm

4y-1=11
4y = 11+1
4y = 12
y = 12/4
y = 3 cm

b.
BC = x+4
BC = 2+4
BC = 6 cm

CD = 4y-1
CD = 4(3)-1
CD = 12-1
CD = 11 cm

K ABCD = 6+11+6+11 = 34 cm

3.
AB = JK
3 = x+1
3-1 = x
2 = x

HI = 2x+1 = 2(2)+1 = 4+1 = 5

5-3 = 2
2/2 = 1