Answer:
2(x-15000y)
Step-by-step explanation:
2x-30000y
2(x-15000y)
As, F is inversely proportional to square of distance between them
a) When it will be doubled the force will reduce 4 times
ie. 10/4 =2.5
b) i) F= k*1/d²
ii) k=3² *2= 18
Therefore F= 18/5² =18/25 =0.72
It’s step 2 when she expand the first bracket she does it incorrectly
10x - 7y = -1....multiply by -1 to make that -7y positive
-2x - 7y = -25
------------------
-10x + 7y = 1 (result of multiplying by -1)
-2x - 7y = -25
-----------------add
-12x = - 24
x = 2
-2x - 7y = -25
-2(2) - 7y = -25
-4 - 7y = -25
-7y = - 25 + 4
-7y = - 21
y = 3
solution is : (2,3)
