Solve the system of linear inequalities with parameters <mtable displaystyle="true"> <mlabel

pokoljitef2

pokoljitef2

Answered question

2022-06-18

Solve the system of linear inequalities with parameters
(*) { 0 2 x + 2 y 3 b + 3 a 2 0 2 x 3 y + 6 b + 3 a 1 0 x 1 0 y 2 0 a 1 0 b 1
Here x,y are unknown variables and a,b are parameters.
My attempt. By adding the inequalities with some coeficients I separated the variables and get the simple system
(**) { 0 y + 6 a 5 , 0 x + 9 a + 3 b 8.
and I am able to solve it. But the solutions of the last system are not solution of the initial system!
Maple and wolframAlpha cant solve the system.
P.S.1 For a = 63 100 and b = 59 100 Maple gives the solutions
{ x = 1 , 9 50 y , y 11 25 } , { x = 3 / 2 y + 127 100 , 9 50 < y , y < 11 25 } , { 9 50 < y , x < 1 , y < 11 25 , 3 / 2 y + 127 100 < x } , { y = 11 25 , 61 100 x , x < 1 } , { x = 3 / 2 y + 127 100 , 11 25 < y , y < 127 150 } , { 11 25 < y , x < 2 y + 47 25 , y < 127 150 , 3 / 2 y + 127 100 < x } , { x = 2 y + 47 25 , 11 25 < y , y < 127 150 } , { x = 0 , 127 150 y , y 47 50 } , { y = 127 150 , x 14 75 , 0 < x } , { 0 < x , 127 150 < y , x < 2 y + 47 25 , y < 47 50 } , { x = 2 y + 47 25 , 127 150 < y , y < 47 50 }

Answer & Explanation

Cristopher Barrera

Cristopher Barrera

Beginner2022-06-19Added 24 answers

9 a + 3 b 8 x 9 a + 3 b
6 a y 5 6 a
These are the equations, and there are constraints
0 x 1
0 y 2
0 a 1
0 b 1
The intersect can exist or not depending to a and b.
Emmy Knox

Emmy Knox

Beginner2022-06-20Added 10 answers

Yours system has no solutions. In fact
{ y 5 6 a , y 2
a 1 2 .But then x 9 a + 3 b 9 2 + 3 b x > 9 2 > 1 but must be x 1.

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