The problem asks us to determine the four inequalities that define the unshaded region $R$ on the $XOY$ plane shown in the image.

GeometryInequalitiesCoordinate GeometryLinear EquationsRegions
2025/3/27

1. Problem Description

The problem asks us to determine the four inequalities that define the unshaded region RR on the XOYXOY plane shown in the image.

2. Solution Steps

From the image, we can identify four lines that bound the unshaded region.
First, there is a vertical line at x=1x = 1. The unshaded region is to the right of this line, so x>1x > 1.
Second, there is another vertical line at x=7x = 7. The unshaded region is to the left of this line, so x<7x < 7. Thus we have 1<x<71 < x < 7 or x>1x > 1 and x<7x < 7.
Third, there is a horizontal line at y=8y = 8. The unshaded region is below this line, so y<8y < 8.
Fourth, there is a diagonal line that appears to pass through (1,0)(1, 0) and (7,6)(7, 6).
Let's find the equation of the line. The slope mm is given by:
m=6071=66=1m = \frac{6 - 0}{7 - 1} = \frac{6}{6} = 1
Using the point-slope form yy1=m(xx1)y - y_1 = m(x - x_1) with point (1,0)(1, 0):
y0=1(x1)y - 0 = 1(x - 1)
y=x1y = x - 1
The unshaded region is above this line, so y>x1y > x - 1.
Combining the inequalities, we have:
x>1x > 1
x<7x < 7
y<8y < 8
y>x1y > x - 1

3. Final Answer

The four inequalities are:
x>1x > 1
x<7x < 7
y<8y < 8
y>x1y > x - 1

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