Answer:
x = 1 and x = -7
Step-by-step explanation:
Given that,
...(1)
and
y = 7 -x ....(2)
Put the value of y from equation (2) in (1)

So,
x = 1 and x = -7
Hence, the solution of the given equations is x = 1 and x = -7
The amount after 3 years would be $221.74
<u>Explanation:</u>
Given:
Principal, P = $200
Rate of interest, r = 3.5%
Time, t = 3 years
Amount, A = ?
We know:

Substituting the value we get:

Therefore, the amount after 3 years would be $221.74