6) twenty-one substracted from a number is -8
The equation for this statement is:
[tex]x-21=-8[/tex]
we substracted 21 from a number x.
Solving the equation:
add 21 to both sides of the equation:
[tex]\begin{gathered} x-21+21=-8+21 \\ x=13 \end{gathered}[/tex]
The number is 13
7) A number increased by 91 is 37.
The equation for this statement:
[tex]x+91=37[/tex]
To solve this equation, we substract 91 from both sides of the equation:
[tex]\begin{gathered} x+91-91=37-91 \\ x=-54 \end{gathered}[/tex]
The number is -54
