Answer:
A) x + y = 8
B) 3x + 2y = 21
We multiply A) by -2
A) -2x -2y = -16 Then we add this to
B) 3x + 2y = 21
x = 5
y = 3
Second answer is correct
Step-by-step explanation:
Answer:
c) 15
Step-by-step explanation:
2x+y-3z=12
2x=4z-y
x=2z-y/2
Answer:
90
Step-by-step explanation:)
To obtain 
, sum the first 4 terms, using n = 1 to n = 4
= 6
+ 6
+ 6(2)² + 6(3)³
= (6 × 1) + (6 × 2) + (6 × 4) + (6 × 8)
= 6 + 12 + 24 + 48
= 90
Answer:
13
Step-by-step explanation:
