Question

could someone please explain what each step is and what each step is called? only 15 and 17 please and thank you

Answer 1

15. 2x-5=-20

2x=-15; Add positive 5 on both sides to isolate x.

x=
`(-15)/(2)`; Divide 2 on both sides to find the value of x.

17.
`(9x)/(4)`=-9

9x=-36; Multiply positive 4 on both sides of the equation.

x==-4; Divide 9 on both sides of the equation to find the value of x.