SOLUTION: Please help me solve: ((4x)/(-5x+13))>=20

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Question 712217: Please help me solve:
((4x)/(-5x+13))>=20
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
((4x)/(-5x+13))>=20 cross multiply
4x>=20(-5x+13)
4x>=-100x+260
4x+100x>=260
104x>=260
x>=260/104
x>=2.5 ans.
proof:
let x=2.5
((4*2.5)/(-5*2.5+13)>=20
((10)/(-12.5+13)>=20
10/.5=20
20=20