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f(x)=2x-1, g(x)=-4x+1. Find the coordinates of the point found at the intersection of ...
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In order to find out the coordinates of the intersection point, we have to say that it's coordinates have to verify the expression of each function, in the same time.
So, in conclusion, we have to solve the system formed by the expression of the 2 functions:
y=-4x+1, 2x-1=-4x+1, 2x+4x=1+1, 6x=2, x=1/3
y=2x-1, y=2*1/3-1, y=-1/3
So, the coordinates of the intersection point are:
Posted by giorgiana1976 on May 30, 2009 at 1:26 AM (Answer #1)
High School Teacher
Let x1 and y1 be the coordinates of the intersection point
of the functions , f(x)=2x-1 and g(x)=-4x+1. Then the cordinates of the intersecting point ,(x1, y1) nturally satisfy both equations. Therefore,
Solve these simulaneous equations:
Equation(1)*2+ equation(2) gives:
2y1+y1=-2+1=-1==> 3y1=-1. or y1=-1/3
Substitute y1 =-1/2 in Eq (1): -1/3=2x1-1=> 2x1=1-1/3=2/3==> x1=1/3.
Therefore, the intersection point f(x) and g(x) is:
(x1,y1) = (1/3,-1/3)
Posted by neela on May 30, 2009 at 8:43 PM (Answer #2)
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