Question

CD bisects AB at D. If AD = 4x - 1 and DB = 9x - 21, find x.

Answer 1

`\\ \ast\sf\hookrightarrow AD=DB`

`\\ \ast\sf\hookrightarrow 4x-1=9x-21`

`\\ \ast\sf\hookrightarrow 9x-4x=-1+21`

`\\ \ast\sf\hookrightarrow 5x=20`

`\\ \ast\sf\hookrightarrow x=(20)/(5)`

`\\ \ast\sf\hookrightarrow x=4`