Question

can someone explain to me how to solve this -3d< -18

Answer 1

To solve

$-3d<-18$

First we have to multiply both sides by -1. This operation flips the inequation sign (not if you multiply by a positive number.

$3d>18$

And now we divide both sides by 3. Since it's positive, the inequation sign doesn't change.

$\frac{3}{3}d>\frac{18}{3}$

And solve the fractions:

$d>6$