How do you solve for a in ab + c = dab+c=d?

1 Answer
Jul 7, 2016

a = (d-c)/ba=dcb

Explanation:

Remember we can do pretty much anything we like to an equation as long as we do the same to both sides.

Subtract cc from both sides:

ab + c color(red)(-c) = d color(red)(-c)ab+cc=dc

therefore ab = d - c

Divide both sides by b

(ab)/(color(red)(b)) = (d-c)/(color(red)(b))

therefore a = (d-c)/b