tentukan nilai x dan y!

Materi : Kesebangunan
Kelas : IX SMP

Penjelasan :

9 / (9 - 4) = 12 / (12 - x)
9 / 5 = 12 / (12 - x)
9(12 - x) = 12 × 5
108 - 9x = 60
-9x = 60 - 108
-9x = -48
x = -48/-9
x = 5,33 cm

9 / (9 - 4) = y / 5
9/5 = y/5
5y = 9 × 5
y = 45/5
y = 9 cm