Final answer:
To solve for e in the equation e + b = 50 with b = 30, substitute the value of b and solve for e, resulting in e = 20. Option (a) is the correct solution.
Step-by-step explanation:
To solve the equation e + b = 50 when b = 30, we simply substitute the value of b into the equation and solve for e.
Substitution Step:
- Replace b with 30 in the equation.
- The new equation becomes e + 30 = 50.
Solving for e:50