Answer:
A=3
Step-by-step explanation:
Replace (x,y) with (8,3) in Ax-4y-12=0:
A(8)-4(3)-12=0
Now solve for A
Simplify - perform some multiplication and use commutative property of multiplication
8A-12-12=0
Simplify- combine like terns
8A-24=0
Add 24 on both sides
8A=24
Divide both sides by 8
A=24/8=3
