Choice A is the correct answer. Find $a$ and $b$.

1. Find a: Y-intercept is 2, so $a=2$.
2. Find b: $y$ goes from 2 to 10. $2 \times b = 10 \implies b=5$.
3. Equation: $y = 2(5)^x$.

💡 Strategic Tip:$b = y_2 / y_1$ when $\Delta x = 1$.

Choice B is incorrect because it swaps $a$ and $b$. Choice D is incorrect because it is linear.