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marissa [1.9K]
4 years ago
9

at 5pm two hip started sailing toward each other from ports which were 300 miles apart at average rates of 20 and 25 mes per hou

r. at what time were the ships still 30 miles apart?
Mathematics
1 answer:
maw [93]4 years ago
7 0
If the average rates were 20 and 25 miles per hour, then together they cover 45 miles of the distance they are separated by per hour.  The ships will be 30 miles apart when 270 miles have been covered, so it takes 270/45=6 hours to cover the distance.  6 hours after 5 PM is 11:00 PM.
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Graph the system of linear inequalities

x + y > 5

- x - y < -5

First we graph x + y >5

Step 1: replace > symbol by = sign

x + y =5

step 2 : Solve the equation for y

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y = 5 - x

step 3: Now we make a table . plug in some number for x  and find out y

x -----> y

-1 -----> 6   ( y=5-x => y=5-(-1)= 6)

0 -----> 5   ( y=5-x => y=5-(0)= 5)

1 -----> 4   ( y=5-x => y=5-(1)= 4)

Step 4:  we graph the table.

step 5: Shade the region that satisfies our inequality

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Graphing second inequality - x - y < -5

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Both graphs overlaps

The graph of first and second inequality overlaps

The graph is attached below

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