I am stuck and have no clue how to solve these mutual funds,

Question

Juan had $24300 and chose to split the money into two different mutual funds. During the first year, Fund A earned 7% interest and Fund B earned 3% interest. If he received a total of $1177 in interest, how much had he invested into each account? 

Answer 1

This is a set of equations:

A + B = 24300

7A + 3B = 1177

First you solve the 1st equation for either A or B so

A = 24300 - B

Now you substitute this to the 2nd equation

(24300 - B) + 3B = 1177 and solve for B

24300 - 1177 = -2B

2B = - 24300 + 1177

B = - 23123

Now substitute this to the 1st equation and solve for A.

Answer 2

x represents the amount at 3%

24300 - x represents the amount at 7%

1177 = 0.03x + 0.07(24300 - x)

Can you solve for x and answer?