Question

Three other ways to solve 2x+9=-15

Answer 1

Step-by-step explanation:

First way:

`\text{Subtract 9 from both sides:} \\ \\ 2x+9-9=-15-9 \\ \\ 2x=-24 \\ \\ \\ \text{Divide by 2 to both sides:} \\ \\ (2x)/(2)=-(24)/(2) \\ \\ x=-12`

Second way:

`\text{Subtract 9 from both sides:} \\ \\ 2x+9-9=-15-9 \\ \\ 2x=-24 \\ \\ \\ \text{Multiply by 1/2 to both sides:} \\ \\ (1)/(2)x=(1)/(2)(-24) \\ \\ x=-12`

Third way:

`\text{Divide by 2 to both sides:} \\ \\ (2x+9)/(2)=-(15)/(2) \\ \\ x+(9)/(2)=-(15)/(2) \\ \\ \\ \text{Subtract 9/2 from both sides} \\ \\ x=-(15)/(3)-(9)/(2) \\ \\ x=-12`