Where is the point (3,-1) translated to after a vertical stretch of 4, a reflection in the x-axis and a horizontal shirt left by 2?

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- Jul 16th 2007, 06:52 AMiorgaParabola
Where is the point (3,-1) translated to after a vertical stretch of 4, a reflection in the x-axis and a horizontal shirt left by 2?

- Jul 16th 2007, 10:42 AMJhevon
start with (3,-1)

if we make a vertical shift, we are changing the y-value. making a shift of +4 is moving up 4 units, so our point becomes:

(3, -1 + 4) = (3 , 3)

now, reflecting in the x-axis is a vertical shift. it's shifting down twice the amount of units we are above the x-axis. you can play around with a graph to see this

so for reflection in the x-axis, we change the y-value to negative, so our point becomes

(3, -3)

a horizontal shift is changing the x-value. changing by 2 is adding or subtracting 2 from the x-value. if you shift to the right, you add, if you shift to the left you subtract. shifting 2 units, i will assume it's to the right

so our point becomes

(3 + 2, - 3) = (5,-3) - Jul 16th 2007, 10:07 PMearboth
- Jul 16th 2007, 10:24 PMJhevon