Question

No 1,2,3 pake caraa ya tlg

Answer 1

No 1.

z-x =

perkalian matriks ordo 2x3

[-1 -1 0] x [x y z] => -x - y = 2
[-1 1 2 ] x [x y z] => -x + y + 2z = 4

-x - y = 2
-x + y + 2z = 4
_____________+
=> -2x + 2z=6

=> 2z - 2x =6
=> z - x = 3

No 2.
a x + b (x + y) = a

b x + 2 a (x + y) = b

berarti b=2a

ax + 2a(x+y) = a
2ax + 2a(x+y) = 2a
-------------------- (-)
-ax = -a
x = 1

ax + 2a (x+y) = a
a + 2a (x+y) = a
1 + 2 (1+y) = 1
2 (1+y) = 0
1+y = 0
y= -1

x+y=
1 + (-1)=0