Question

What is 4.5b + 9 = 90

Answer 1

Easy


just remember

you can do ANYTHING to an equaiton as long as you do it to both sides


try to get place holder by itself


4.5b+9=90
minus 90 from both sides
4.5b+9-9=90-9
4.5b+0=81
4.5b=81
either divide both sides by 4.5 or double 4.5 to get rid of the decimal
I will double
double both sides
9b=162
divid both sides by 9
b=18


 

Answer 2

4.5(18)+9=90
81+9=90
so b=18