Answer:
9y + 4z + 9x
Step-by-step explanation:
U = -b + 21 . . . (1)
u = -2b + 30 . . . (2)
Equating (1) and (2),
-b + 21 = -2b + 30
-b + 2b = 30 - 21
b = 9
u = -9 + 21 = 12
Therefore, (b, u) = (9, 12).
Answer:
y= 10
Step-by-step explanation:
-3x-5y=4
+3x +3x
-5y=7x
+5y +5y
y= 10
Answer:
3÷8=0.375
Step-by-step explanation:
1/8 of a number can be found by dividing the number by 8.
There are no solutions. By definition of absolute value, 
, so 
. The left side will always be positive, and a positive number cannot also be negative.
