jkummes jkummes

21-10-2016
Mathematics

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If 4x-2y>3 and 2x-2y<18, which must be true?

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Аноним Аноним

21-10-2016

let's say 2y < 18 - 2x
so
4x - 2y > 3
4x - 18 - 2x > 3
2x > 21
2x/2 > 21/2
x > 10.5

2y < 18 - 2(10.5)
2y < 18 - 21
2y < -3
y < 1.5

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