The value of a is -8
The subject of a formula is the variable or expression that represents the quantity being solved for.
In mathematical equations, it is the element isolated on one side to determine its value based on the given information in the formula.
Making a the subject of the formula,
8+3 = 3 - a
collect like terms
-a= 8 + 3 -3
-a = 8
divide both sides by -1
a = -8
Therefore making a the subject , the value of a is -8