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Marina86 [1]
3 years ago
6

David is rowing a boat upstream. The river is flowing at a speed of 2 miles per hour. David starts rowing at a speed of 6 miles

per hour, and his speed decreases at a rate of 1.5 miles per hour.
The equation gives the speed of the boat after David has rowed for x hours? can someone help
y=4+1.5x
y=4-1.5x
y=6-1.5x
Mathematics
2 answers:
jonny [76]3 years ago
8 0
<span>The equation that gives the speed of the boat after David has rowed for x hours is </span><span>y=4-1.5x. 
</span>
The direction David is rowing (upstream) is the positive direction. That makes the direction the river is flowing negative. David rows at 6 mph, but the river is flowing at 2 mph in the opposite direction. That means his "net" speed, relative to an observer on the ground, is 6-2 = 4 mph. He loses 1.5 mph of his speed every hour, so after x hours, his speed is 4-1.5x. 
horsena [70]3 years ago
5 0
Hello there.

<span>David is rowing a boat upstream. The river is flowing at a speed of 2 miles per hour. David starts rowing at a speed of 6 miles per hour, and his speed decreases at a rate of 1.5 miles per hour.
The equation gives the speed of the boat after David has rowed for x hours? can someone help

</span><span>y=4-1.5x</span>
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