Answer:
Always true if a does not equal zero
Never true if a equals zero
Step-by-step explanation:
ax + b - 4 =b
Subtract b from each side
ax + b-b - 4 =b-b
ax -4 =0
Add 4 to each side
ax =4
Divide each side by a (a cannot equal zero)
ax/a = 4/a
x = 4/a
