7 small boxes and 14 large boxes were shipped.
Step-by-step explanation:
Given,
Weight of small box = 50 pounds
Weight of large box = 75 pounds
Total boxes shipped = 21
Weight of shipped boxes = 1400 pounds
Let,
x represent the number of small boxes.
y represent the number of large boxes.
According to given statement;
x+y=21 Eqn 1
50x+75y=1400 Eqn 2
Multiplying Eqn 1 by 50
Subtracting Eqn 3 from Eqn 2
Dividing both sides by 25
Putting y=14 in Eqn 1
7 small boxes and 14 large boxes were shipped.
Keywords: linear equation, elimination method
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