Question

14.
Using elimination to solve the system 2x + y = 8 and x + y = 4, which of the following could be the first step?
(Points : 2)

2x + y = 8--------> 2x + y = 8
(x + y = 4)(-1)---> -x - y = -4


2x + (4 - x) = 8


2x + y = x + y


3x + 2y = 12


x = 4


15.
Solve the system x + y = 6 and x - y = 2. What is the value of x?
(Points : 2)

6


2


4


0

Answer 1

1)2x + (4 - x) = 8

Answer 2

x+y=6
x-y=2
add the equations:
2x = 8
x = 4