Chapter 0.5, Problem 30E

To determine

To solve the equation $21-b=11$

Answer to Problem 30E

  $b=10$

Explanation of Solution

Given Information: $21-b=11$

Formula Used : Linear equations with one variable

Calculation:

Given equation is

  $21-b=11$

To isolate the variable b, subtract 21 from both sides-

  $21-21-b=11-21$

This gives-

  $-b=-10$

To isolate the variable b, divide by (-1) both side-

  $\frac{-b}{-1}=\frac{-10}{-1}$

Hence the final answer is-

  $b=10$