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secondary 3 | E Maths
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need help with c
Date Posted: 1 year ago
Views: 213
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incorrect answers for (b) & (c)
(b)
from the diagram,
point B is left side of origin, so should be ...
coordinates of B = (-5,0)
note : coordinates of C = (2,0)
(c)
when a straight line slants from top left to bottom right, gradient must be negative.
when a straight line slants from bottom left to top right, gradient must be positive.
gradient AB = (10-0)/(0-(-5)) = 2 [ positive ! ]
sub (2,0) into equation
(0) = (2)(2) + c
c = -4
equation of line passing through C is y = 2x-4
(b)
from the diagram,
point B is left side of origin, so should be ...
coordinates of B = (-5,0)
note : coordinates of C = (2,0)
(c)
when a straight line slants from top left to bottom right, gradient must be negative.
when a straight line slants from bottom left to top right, gradient must be positive.
gradient AB = (10-0)/(0-(-5)) = 2 [ positive ! ]
sub (2,0) into equation
(0) = (2)(2) + c
c = -4
equation of line passing through C is y = 2x-4
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