Answer:
By substituting that value of x back into the equation and see if you end up with a true statement.
Step-by-step explanation:
for example, let’s solve:
2x + 3 =
2x = 10
x = 5
Ok now plug that 5 back into the bold above and see if you get a true statement.
2x + 3 = 13
2*5 + 3 ?= 13
10 + 3 ?= 13
13 = 13 YES!!
The ? next to the = sign is read “does it equal?”
