Number one is a=4
step by step explanation:
Inverse operation of addition is subtraction.
a+5=9
-5 -5
a= 4
First thing you want to do is isolate “a”so you have to subtract 5 from both sides of the equation so you can be left with x alone. That will give you a=4
Number 2: is y=16
y - 4 =12
+ 4 +4
y= 16
In this equation the inverse operation of subtraction is addition. So instead of subtracting 4 by both sides of the equation like we did in number one… you will add 4 to both sides of the equation to cancel out the 4 and have “y” by it self.