Question 501214
Memory aid for "order of operations" is PEMDAS:
P:Parentheses first
E:Exponents next
MD: multiply/divide taken left to right
AS: addition/subtraction taken left to right
.
4[2(-5x+y)-y]-10(y-4x) 
4[(-10x+2y)-y]-10(y-4x) 
4[-10x+2y-y]-10(y-4x) 
4[-10x+y]-10(y-4x) 
[-40x+4y]-10(y-4x) 
[-40x+4y]-(10y-40x) 
[-40x+4y]-10y+40x 
-40x+4y-10y+40x 
group like-terms:
(-40x+40x)+(4y-10y)
(0x)+(-6y)
0+(-6y)
(-6y)
-6y