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Question

The points that satisfy the system x+y=1,x2+y2<25, where the symbol "<" means "less than," constitute the following set:

A
only two points
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B
an arc of a circle
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C
a straight line segment not including the end points
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D
a straight line segment including the end points
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E
a single point
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Solution

The correct option is C a straight line segment not including the end points
x+y=1 denotes a line, whereas x^2+y^2<25 denotes region inside a circle with centre (0,0) and radius 5 not including the points on the circle. So system satisfying these 2 conditions will contain points on the line x+y=1 inside the circle excluding the two points of intersection.

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