The interest earned in 6 years would be:
$280 / 4 = $70
$70 * 6 = $420
Answer:
the slope is -1, rise over run and since the line goes down from left to right it is negative
Essentially, what you need to do is ensure that both sides cancel each other out to make 0 = 0
An example:
2(x + y) + 4 = (4x + 4y + 8)/2
2x + 2y + 4 = 2x + 2y + 4
0 = 0
