math
posted by 565 .
DETERMINE SO THAT 5X+KY=8 WILL PASS THROUGH (4,3)

I assume we are to find out what k must be so that the straight line
5 x + k y = 8
goes through x=4 and y=3
To do that put 4 in for x and 3 in for y
5(4) + k(3) = 8
solve that for k 
There was a man that had 7 apples. A kid stole 3 apples of the man's. How many does the man have know?

4 apples left

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If he ate none.