Question

I need help with #9 and plz show work :)

Answer 1

`\large\boxed{q=(1-pr)/(p)}`

Explanation:

`p(q+r)=1\qquad\text{use the distributive property}\\\\pq+pr=1\qquad\text{subtract}\ pr\ \text{from both sides}\\\\pq=1-pr\qquad\text{divide both sides by}\ p\\eq0\\\\q=(1-pr)/(p)`