It takes y years for N 87,300.00 to amount to N 99,522.00 at 7% per annum simple interest. Find the value of y.

The simple interest is the difference between the amount and the principal.

The formula for simple interest is $I = P \times R \times T$, where $P$ is the principal, $R$ is the annual interest rate (as a decimal), and $T$ is the time in years.
Given $P = \text{N } 87,300$, $R = 7\% = 0.07$, and $I = \text{N } 12,222$.

The value of $y$ is 2 years.

The correct option is C.

We have two equations:

1. $3a - 2b = 12$
2. $a + 5b = -13$

From equation (2), express $a$ in terms of $b$:

Substitute this expression for $a$ into equation (1):

The correct option is D.

The point-slope form is $y - y_1 = m(x - x_1)$, where $(x_1, y_1)$ is a point on the line and $m$ is the gradient (slope).
Given point $(x_1, y_1) = (-9, 10)$ and gradient $m = \frac{1}{3}$.

Add 10 to both sides of the equation:

This can also be written as $y = \frac{x}{3} + 13$.

The correct option is C.