Final answer:
To find the missing number in the expression 5x + 1, we need to solve the given equation 5x + 3 = 17 and substitute the value of x into the expression.
Step-by-step explanation:
To find the missing number, we need to solve the equation 5x + 3 = 17 and then substitute the value of x into the expression 5x + 1.
First, let's solve the equation 5x + 3 = 17.
Subtracting 3 from both sides of the equation, we get 5x = 14.
Dividing both sides by 5, we find that x = 2.8.
Now, substituting x = 2.8 into the expression 5x + 1, we get 5(2.8) + 1 = 14 + 1 = 15.
Therefore, the missing number is 15.
Learn more about missing numbers in equations