Question

a)-8y-4z+x-y-2z+1 dla x=-0,5 y=-1 z=2
b)9y-(7y+x)+(6x-7y) dla x=-2,y=3

Answer 1

A)-8y-4z+x-y-2z+1 dla x=-0,5 y=-1 z=2
-8y-4z+x-y-2z+1=-9y-6z+x+1=-9*(-1)-6*2-0,5+1=-2,5
b)9y-(7y+x)+(6x-7y) dla x=-2,y=3
9y-(7y+x)+(6x-7y)=9x-7y-x+6x-7y=14x-17y=14*(-2)-14*3=-28-42=-70

Answer 2

A)-8y-4z+x-y-2z+1 dla x=-0,5 y=-1 z=2
b)9y-(7y+x)+(6x-7y) dla x=-2,y=3
Więc,
a)-8y-4z+x-y-2z+1 =
-9y - 6z + x +1=
= -9 * (-1) - 6 * 2 + (-0,5) + 1
= 9-12-0.5+1 = -2.5