The coefficients are:
2
-5
1
Think of dividing by 2 splitting it in half, if you round it you get about 1500 then split that in half. it would be around 750.
(-4,-3) and (4,1)
slope = (1 + 3)/(4+4) = 4/8 = 1/2
perpendicular lines, slope is opposite and reciprocal
so slope of new line = -2
passing thru (-4, 3)
equation in point slope form
y - 3 = -2(x + 4)
answer
y - 3 = -2(x + 4)
hope it helps
Answer:
The answer is below
Step-by-step explanation:
a) Let x represent the time taken to drive to see the relatives and let d be the distance travelled to go, hence:
60 mi/h = d/x
d = 60x
When returning, they still travelled a distance d, since the return trip takes 1 h longer than the trip there, therefore:
40 mi/h = d/(x+1)
d = 40(x + 1) = 40x + 40
Equating both equations:
60x = 40x + 40
60x - 40x = 40
20x = 40
x = 40/20
x = 2 h
The time taken to drive there = x = 2 hours
b) The time taken for return trip = x + 1 = 2 + 1 = 3 hours
c) The distance d = 60x = 60(2) = 120 miles
The total distance to and fro = 2d = 2(120) = 240 miles
The total time to and fro = 2 h + 3 h = 5 h
Average speed = total distance / total time = 240 miles / 5 h = 48 mi/h