SOLUTION: hi can you please help me solve this. one of the other tutors helped me with this but i got confused with his/her answer. it says substitute x= -4 and y= -15 to find the value of

Question 14600: hi can you please help me solve this. one of the other tutors helped me with this but i got confused with his/her answer.
it says substitute x= -4 and y= -15 to find the value of the expression.
-3 (4x - y)
thank you

Answer by longjonsilver(2297) (Show Source): You can put this solution on YOUR website!
-3[4x-y]
-3[4(-4) - (-15)]
-3[4(-4) + 15]
-3[-16 + 15]
-3[-1]
+3

explanations:
4(-4) means (+4)*(-4) --> + and - give - and 4*4 is 16
-(-15) means (-1)*(-15) --> - and - give + and 1*15 is 15

jon.

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