If the linex - y = 1abpasses through the points (2,

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If the line x - y = 1
a b

passes through the points (2, –3) and (4, –5) then (a, b) is

The line	x	+	y	= 1, passes through (2, –3)
	a		b

∴	2	-	5	= 1
	a		b

Similarly, The line passes through (4, –5)

∴	4	-	5	= 1
	a		b

Point (–1, –1) satisfies both the equation.