solve 4/5x=80?

Assume equation is:-
(4/5) x = 80
4x = 400
x = 100

u multiply 5 on both side so you get 4x=400 and divide both sides by 4 to get x=100

(4/5)x=80

x=(5/4)*80

x = 100

4/5x = 80

4 = 80*5x

4 = 400x

x = 4/400

x = 1/100 = 0.01

You have got to be kidding this far into the semester or quarter and you haven't gotten the transposing fractions by inverting and mutliplying down yet?

Ok!

4/5x = 80 transpose 4/5 by inverting and mutliplying by 5/4

5/4 * 4/5x = 80 * 5/4

5/4 * 4/5 cancel each other out so you are left with.

x = 80 * 5/4 or:
x = 80 /1 * 5/4
which gives you
x = 400 / 4
simplify the fraction:
x = 100 / 1 and 1 divided into 100 = 100
answer is:
x = 100

4/5x=80 Source equation

4=400x (multiply both sides by 5x)

400x=4 (switch sides) (optional)

x= 4/400
= 1/100
= 0.01

1)
4/5 x = 80
4x/5 = 80
4x/5 x 5 = 80 x 5
4x = 400
4x/4 = 400/4
x = 100

4/5x=80
4x=400
x=100

(4/5)x=80
4x = 80×5
x = 400 / 4
x = 100

100