5.) x + 3y = 21
- 4x + y = 0

Step-by-step explanation:

x + 3y = 21

- 4x + y = 0

y = 4x

x + 3y = 21

x + 3(4x) = 21

x + 12x = 21

13x = 21

x = 21/13

y = 4x

y = 4 (21/13)

y = 84/13

(x, y) = (21/13 , 84/13)

the answer

b. they are parallel and will never intersect.

hello,

as we don't know if g(x) is continue,

answer b

f(x)=2x²-8x+1=2(x²-4x+4)+1-8=2(x-2)²-7

vertex is (2,-7) ( a minimum since coefficient of x² is > 0)