Answer:
(B) 109
Explanation:
3y + 4 = 31
First step is to find y. To find out what y is, we must isolate the variable. We can do this by working backwards.
3y + 4 = 31
Subtract 4 on both sides.
3y = 27
Divide by 3 on both sides
y = 9
Now we know that y = 9, we can plug it into the expression of 'y + 100.'
y + 100 = 9 + 100 = 109
The value of y + 100 is 109.