We can substitute 4b with 12, because 4 * 3 = 12. 4b is the same as 4 different b's, and when we know b is 3, we can multiply 4 by 3 to get 12.
7 + 4b =
7 + 4 * 3 =
7 + 12 =
19.
7 + 4b when b = 3 is 19.
Answer:
19
Step-by-step explanation:
Since we know the value of b we can add it into the equation
1. 7+4(3)
Now we can simplify, lets start with multiplication
2. 7+12
Finally, simplify
3. 7+12= 19
