Answer: S = $76,923 F = $23,077
Explanation:
You can use substitution method or elimination method. I am using the elimination method to solve:
S + F = 100,000 → -7( S + F = 100,000) → -7S - 7F = -700,000
.07S +.2F = 10,000 → 100(.07S +.2F = 10,000) → 7S + 20F = 1,000,000
13F = 300,000
F = 23,077
S + F = 100,000
S + 23,077 = 100,000
-23,077 -23,077
S = 76,923