Question

Help please!!!
4x-9=-5x-99???

Answer 1

4 x - 9 = - 5 x - 99 Add 5 x to both sides

4 x - 9 + 5 x = -5 x - 99 + 5

9 x - 9 = - 99 Add 9 to both sides

9 x - 9 + 9 = - 99 + 9

9 x = - 90 Divide both sides by 9

9 x / 9 = - 90 / 9

x = - 10


Proof:

4 x - 9 = - 5 x - 99

4 * ( - 10 ) - 9 = - 5 * ( - 10 ) - 99

- 40 - 9 = 50 - 99

- 49 = - 49

Answer 2

4 x - 9 = - 5 x - 99 Add 5 x to both sides

4 x - 9 + 5 x = - 5 x - 99 + 5 x

Answer 3

Thank you so much, my hw is all mixed equations so yeah.