Answer:
Step-by-step explanation:
Bus One
speed = x
t = 7 hours
d = ?
Bus two
speed = x + 11
time = 7 hours
d1 = 1015 miles - d
Equations
d = s * t
Bus 1 + bus 2 = 1015
Solution
x * 7 + (x + 11)*7 = 1015
7x + 7x + 11*7 = 1015
14x + 77 =1015
14x + 77 - 77 = 1015 - 77
14x = 938
14x/14 = 938/14
x = 67 miles / hour
x + 11 = 78 miles / hour
Let the number = x
Writing the equation you have:
10x + 15 <= -17
Solve for x
Subtract 15 from both sides:
10x <= -32
Divide both sides by 10:
X <= -32/10
Simplify:
X <= -16/5 as a fraction or -3.2 as a decimal
That would be Graph C
The solution is where the 2 graphs intersect At A and B.
x + y + 2 = 0 transforms to y = -x - 2 which has slope -1 and y-intercept of -2
as in Graph C.
Answer:
x=7.
If you need more explanation I can help, just ask
How to solve this: (in case you need it)
4n-18=52
4n-18+18=52+18
4n=70
4n/4=70/4
n=35/2