Can someone please help me with these 2 problems PLEASE????????
1) 1) Simplify the algebraic expression
5xy - 3yz - 5xz + yz - 4xz + 7xy and evaluate it for x = 10, y = -4, z = -6.
Identify the variables, constants, and coefficients in the simplified expression.

Question

Can someone please help me with these 2 problems PLEASE???????? 
1) 1)	Simplify the algebraic expression
5xy - 3yz - 5xz + yz - 4xz + 7xy and evaluate it for x = 10, y = -4, z = -6.  
Identify the variables, constants, and coefficients in the simplified expression.

anonymous · Answer

add like terms first. Later substitute x,y,z values

anonymous · Answer

so would it be 
5xy - 3yz - 5xz + yz - 4xz + 7xy
                5 *10*4 -3*4*6 – 5*10*6 + 4*6- 4*10*6+ 7*10*4
               50*4- 12*6- 50*6+24-40*6+70*4
               200-72-300+24-240+280
               128-324-520
               128-196=68