A Horizontal line means you get a slope of zero
Setup
0.8x + 0.4y = 50
0.1x + 0.2y = 10 - Multiply by -2 and add
get
0.6x = 30
x = 50 mg compound A
.1 (50) + .2y = 10
5 + .2y = 10
.2y = 5
y = 25 mg compound B
X = 14
Y = 16
I hope I could help!
Substract 6 to both sides and you get 36 =-2d then you use the multiplicative inverse and d=-18.
