Solve the system using substitution.

y = 7x - 12

y = x2

A) (-3,9), (-4,16)

B) (-3,9), (4,16)

C) (3,9), (-4,16)

D) (3,9), (4,16)

C) (3,9), (-4,16)

Step-by-step explanation:

hello:

the system is : y = 7x - 12

y = x²

x²=7x-12

x²-7x+12=0

∆ = b² - 4ac a = 1 b = - 7 c=12

∆ = (-7) ² - 4 (1) (12) = 49-48 = 1

X1 = (-b-√∆) / 2a = (7-1) / 2=3

X2 = (-b+√∆) / 2a = (7+1) / 2=4

but : y=x²

if : x = 3 y=9

if : x=4 y=16

two solutions:

answer : C) (3,9), (-4,16)