Answer: she was not correct, she messed up the equation.
I'm assuming you want an equation with a slope of -5 that also passes through the point (1, -7).
An equation that fits this is

Hope this helps!
Answer:
Huh?
Step-by-step explanation:
Um 3 times 3/8 = 1.125
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Answer:
50 km/hr
Step-by-step explanation:
D = RT
Time for first part of trip = 80/60 = 4/3 hr.
Time for second part of trip = 20/30 = 2/3 hr.
total time for entire trip = 4/3 + 2/3 = 6/3 = 2 hr.
Total distance = 100 km
Average rate of speed for entire trip = 100/2 = 50 km/hr