solve the following system by any method -3x+5y=-9 and 4x+8y=12

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19-12-2017
Mathematics

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solve the following system by any method -3x+5y=-9 and 4x+8y=12

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A bookcase has a base of 1 m long and 0.5 m wide. It has a mass of 300kg. Find the pressure it exerts on the floor in kPa.

ElenaClaudia ElenaClaudia · Answer 1 · 2017-12-26T18:31:05+01:00

ElenaClaudia ElenaClaudia

26-12-2017

-3x + 5y = -9 │ × 4
4x + 8y = 12 │ × 3

-12x + 20y = -36
12x + 24y = 36 +
-------------------------------
/ 44y = 0 ⇒ y = 0

4x + 8y = 12 but y = 0
4x + 0 = 12
4x = 12
x = 12/4
x = 3

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