Question

If x=5 and y= -4, evaluate this expression: (-2x +10) - (-6x + 5y + 12) + (x +8y - 16)

Answer 1

The value of the expression is - 5.

Explanation:

(-2x +10) - (-6x + 5y + 12) + (x +8y - 16)=

-2x+10+6x-5y-12+x+8y-16=

(-2x+6x+x)+(-5y+8y)+(10-12-16)=

5x+3y-18

if x=5 and y=-4 then

5*5+3*(-4)-18=25-12-18=25-30=-5