What the equation

Question

DIEGO works at a warehouse that ships two types of packages a red package weighing. 4 pounds and a blue package weighing 6 pounds. DIEGO shipped a total of 40 packages weighing 180 pounds write an equation

Answer 1

R+B = 40

4R + 6B = 180 ---> 2R + 3B = 90

By substitution: B = 40 - R from the first equation.

2R + 3(40 - R) = 90

2R + 120 - 3R = 90

120 - R = 90

120 = 90 + R

120 - 90 = R

R=30

30 red, 10 blue