JK passes through the points J(–2,4) and K(1,10). J'K' is the image of JK after a dilation with a scale factor of 34 centered at (–4,0).What is the equation of J'K'?Write your answer in slope-intercept form.
Question
JK passes through the points J(–2,4) and K(1,10). J'K' is the image of JK after a dilation with a scale factor of 34 centered at (–4,0).What is the equation of J'K'?Write your answer in slope-intercept form.
Solution
To find the equation of the line J'K', we first need to find the coordinates of points J' and K' after the dilation.
The formula for dilation is:
X' = a * (X - h) + h
Y' = a * (Y - k) + k
where (X,Y) are the original coordinates, (X',Y') are the new coordinates after dilation, (h,k) is the center of dilation, and a is the scale factor.
Given that the center of dilation is (-4,0) and the scale factor is 3/4, we can substitute these values into the formula to find the new coordinates.
For point J(-2,4):
X' = 3/4 * (-2 - (-4)) - 4 = -3
Y' = 3/4 * (4 - 0) = 3
So, J' is (-3,3).
For point K(1,10):
X' = 3/4 * (1 - (-4)) - 4 = -1
Y' = 3/4 * (10 - 0) = 7.5
So, K' is (-1,7.5).
Now that we have the coordinates of J' and K', we can find the slope of the line J'K'. The formula for slope is (Y2 - Y1) / (X2 - X1).
Slope = (7.5 - 3) / (-1 - (-3)) = 4.5 / 2 = 2.25
The y-intercept (b) is found by substituting one of the points and the slope into the equation y = mx + b. Let's use point J'(-3,3):
3 = 2.25 * -3 + b
b = 3 + 6.75 = 9.75
So, the equation of the line J'K' in slope-intercept form is y = 2.25x + 9.75.
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