Question

Make r the subject of 5r+1= a(m + r) ​

Answer 1

See below

Explanation:

xpand R sid to get

5r+1 = am + ar subtract 'ar' from both sides

5r - ar + 1 = am factor out 'a'

r ( 5-a) + 1 = am

r (5-a) = am-1 divide both sides by ' 5-a'

r = (am-1 ) / (5-a)