How do you solve and check your solutions to -21=-3/5t?

1 Answer
Apr 15, 2017

t=35

Explanation:

Our main goal here is to make t stand alone

We can start by writing what is on the left hand side as a fraction.

(-21)/1=-3/5t

Now let's cross product or cross multiply to get rid of the fractions

-21xx5=1xx-3t

Simplify

-105=-3t

Divide both sides by -3

(cancel(-)105)/(cancel(-)3)=(cancel(-3)t)/(cancel(-3)

t=105/3=(cancel3xx35)/cancel3

rArrt=35

To check, you simply substitute t=35 into the original equation.

-21=-3/5t, t=35

-21=-3/5xx35

-21=-105/5

Cross product

-21xx5=-105

-105=-105

BAM!