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kesebangunan

4/(4 + 2) = 6/(6 + x)

4/6 = 6/(6 + x)

6 + x = 6 × 6/4

6 + x = 9

x = 3

6/(6 + x) = y/(y + 4)

6/9 = y/(y + 4)

2/3 = y/(y + 4)

3y = 2(y + 4)

3y = 2y + 8

3y – 2y = 8

y = 8