Answer:
x = -3
y = 6
z = -5
Step-by-step explanation:
A) x + y + 2z = -7
B) -5z = 25
C) 3x - 3y - 6z = 3
B) -5z = 25
z = 25/-5
(z = -5)
A) x + y + 2(-5) = -7
x + y = -7 + 10
x + y = 3
(x = 3 - y)
C) 3x - 3y + 6(-5) = 3
3x - 3y + 30 = 3
3x - 3y = -30-3
3x - 3y = - 27
C) 3 (3-y) - 3y + 30 = 3
9 - 3y - 3y+ 30 = 3
-6y + 39 = 3
-6y = -39 + 3
y = -36/-6
(y = 6)
x + 6 = 3
x = 3 -6
(x = -3)
5 pounds for $12.95 is the better choice since it is cheaper per pound. ($2.59) versus 3 pounds which is ($2.77)
Answer:
a) will definitely be an odd number
Step-by-step explanation:
4^n is always even (when you multiply even and even number, the product is always even)
when you add one to even number, the sum is always odd
so 4^n +1 is odd.
