Solve for b and c using addition or substitution
159 b + 3.3 c = 1000 mg
2.3 b + 0.3 c = 18 mg
159b + 3.3c=1000 Solve equation for c
3.3c=1000-159b
c=(1000-159b)/3.3
Substitute this value of c into the second equation:
2.3b + 0.3 (1000-159b)/3.3 =18 Sove THIS equation for b
2.3b + (300 - 47.7b)/3.3 =18
2.3b + 90.909 - 14.45b = 18
-12.15b = --72.909
b= 72.909/12.15 = 6.000
c=(1000-159b)/3.3 = (1000-159(6.000))/3.3 = 13.94
