1. Problem: If the point (3,4) lies on the graph of the equation $3y = ax - 7$, find the value of $a$. 2. Substitute $x=3$ and $y=4$ into the equation: $$3(4) = a(3) - 7$$ 3. Simplify the left side: $$12 = 3a - 7$$ 4. Add 7 to both sides: $$12 + 7 = 3a$$ $$19 = 3a$$ 5. Divide both sides by 3: $$a = \frac{19}{3}$$ 6. Final answer: $a = \frac{19}{3}$. --- Note: The user asked multiple questions but per instructions, only the first problem is solved here.