C) (3,9),(-4,16)
Step-by-step explanation:
hello :
the system is : Â 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 Â Â y=9
if : x=4 Â Â y=16
two solutions : Â
answer :C) (3,9),(-4,16)