Which two points satisfy y = -x2 + 2x + 4 and x + y = 4? A. (0, 4) and (4, 0) B. (0, 4) and (3, 1) C. (7, -3) and (0, 4) D. (7,
-3) and (4, 0)
1 answer:
You might be interested in
Margaret traveled 80 miles to the appointment.
Step-by-step explanation:
Given,
Speed while driving for appointment = 80 mph
Speed while coming back = 70 mph
Let,
x be the time taken for the trip
y be the distance covered
Distance = Speed*Time
y = 80x Eqn 1
Time taken in return trip = x+1/7
y = 70(x+1/7)
Eqn 2
Putting value of y from Eqn 1 in Eqn 2
Dividing both sides by 10
x = 1 hour
Putting x = 1 in Eqn 1
Margaret traveled 80 miles to the appointment.
Keywords: linear equation, substitution method
Learn more about substitution method at:
#LearnwithBrainly