Does the point (-1, 2) lie on the graph of y = -2x + 3?

1 Answer
Alan P.
Jul 8, 2016

#(-1,2)# does not lie on #y=-2x+3#

Explanation:

#(color(red)(-1),color(blue)(2))# is a point on #color(blue)(y)=-2color(red)(x)+3#
if (and only if)
#y=color(blue)(2)# when #x=color(red)(-1)# in #y=-2x+3#

#y=-2(color(red)(-1))+3=+2+3=color(green)(5)#

Since #color(green)(5) != color(blue)(2)#
#(-1,2)# does not lie on the line #y=-2x+3#

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