Ty D. answered • 10/03/18

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Let x = large boxes and y = small boxes

3x+5y=132

9x+7y=279

Solve the system of equations by multiplying the first equation by (-3) and adding the two equations together.

-9x-15y=-396

9x+7y=279

__________

-8y=-117

y=14.6≈15 kilograms (weight of small boxes)

Use either original equation and the weight of the small boxes to find the weight of the large boxes.

3x+5y=132

3x+5(15)=132

3x=57

x=19 kilograms (weight of small boxes)

Small boxes weigh approximately 15 kilograms and large approximately 19.

**You could calculate this keeping the decimal points, but the probably didn't specify what place to round to.