15% of 45 is 0.15 x 45 or 6.75 feet. That's how far the submarine descended in 1 minute. So, in 4 minutes the submarine would be 4 x 6.75 feet down which is 27 feet.
Answers:
y intercept = -4
slope = -1
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Explanation:
The given equation is the same as y = -1x + (-4)
Compare this to y = mx+b form, and we see that
m = -1 is the slope
b = -4 is the y intercept
To graph y = -x-4, you could plot the two points (0,-4) and (1,-5) and draw a straight line through them. Extend the line as far as you can in either direction.
Notice how going from (0,-4) to (1,-5) follows the process "down 1, right 1" which is directly pulled from the slope = -1 = -1/1.
The value of 4 is in the ones place
Add the two equations to get -y=-1. So, y=1. Solving for x, you get that x=5.
So the solution is (5,1)
A five percent tip of 81.24 would be 85.30, and rounded to the nearest ten dollars, it would be 90 even.
