The given system of inequality: {(y<9-x^2),(y>=x+3):}

alesterp 2020-11-12 Answered

The given system of inequality:
{y<9x2yx+3
Also find the coordinates of all vertices, and check whether the solution set is bounded.

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Expert Answer

gotovub
Answered 2020-11-13 Author has 98 answers

Graph:
The given system of the inequalities is,
1) (y<9x2)
2) (yx+3)
The corresponding equation of the inequality (1) is,
y=9x2
Since, the inequality (y<9x2)involves the stricly less than sign, then the points on the parabola (y=9x2) does not satisy the inequality (y<9x2)
Therefore, the parabola y=9x2 itself is not the part of solution set.
The corresponding equation of the inequality (2) is,
y=x+3
Since, the inequality yx+3 involves the greater than or equal to sign, then the points on the line y=x+3 satisfies the inequality yx+3
Therefore, the line y=x+3 itself is the part of the solution set.
Consider the test point (0, 4) to check whether the solution satisfies each inequality of the given system.
Substitute 0 for x and 4 for y in the inequality y<9x2.
y overset(?)(<)9x2
4 overset(?)(<)90
4<9
The point (0, 4) is inside the parabola y=9x2 and satisfies the inequality y<9x2. So it is the part of the solution set.
Substitute 0 for x and 4 for y in the inequality yx+3.
y overset(?)()x+3
4 overset(?)()0+3
43
The point (0, 4) is below the line y=x+3 and satisfies the inequality y>+x+3. So it is the part of the solution set.
Therefore, the test point (0, 4) satisfies each inequality of the given system.
The solution set of the given system of inequalities is the intersection of the solutions of each of the given inequality.
Therefore, the solution set is shown as shaded region in Figure 1.
image
The vertices occur at the points of intersection of the corresponding equation of the given system of inequalities.
3) y=9x2
4) y=x+3
It is observed from Figure 1 that the parabola y=9x2 and line y=x+3 intersect eqch other.
Substitute x+3 for y in equation (3).
y=9x2
x+3=9x2
x2+x=93
x2+x6=0
Further solve the above equation for the value of x.
x2+3x2x6=0
(x2)(x+3)=0
x+3=0orx2=0
x=3orx=2
Therefore, the x-coordinate of vertex are -3 and 2.
Substitute -3 for x in equation (3).
y=9x2
y=9(3)2
Substitute 2 for x in equation (3).
y=9x2
y=9(2)2
y=94
y=5
Therefore, the y-coordinate of vertex are 0 and 5.
Therefore, the vertices of the shaded region are (-3, 0) and (2, 5).
It is observed from Figure 1 that the shaded region is enclosed by the boundary lines of the given system of inequalities.
Therefore, the shaded region is bounded.
Interpretation:
The solution set of the given system of inequality lies in I and II quadrant as shown in Figure 1.
Conclusion:
Thus, the vertices of the given system of inequalities are (-3, 0) and (2, 5), the solution set is bounded.

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