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65x+100=80x+40

80x-65x=100-40

15x=60

x= 60/15

so x=4

Step-by-step explanation:

Hope this helps <3

y= x +100/65

y= x+ 20/13

y=80x+40

y= x + 40/80

y= x+ 1/4

the answer is (4,3)

since the rule for r0, 90º is (-y,x) and it was already applied to form the image, all you have to do is reverse the answer using this formula.