Tuesday

October 21, 2014

October 21, 2014

Posted by **amanda** on Wednesday, November 5, 2008 at 12:40am.

a. write an equation to describe the height y, in feet, of the bamboo plant x days after you measure it.

would it be: x+y=4?

b. what is the y intercept?

- slope(using intercepts) -
**Dr Russ**, Wednesday, November 5, 2008 at 4:46amwould it be: x+y=4?

This is clearly this not correct if you put numbers into the equation. If y is the height after 10 days then the height is the plant is

10+y=4

so y=-6 or 6ft below ground!

The correct equation is

y=4+x

where both y and x are in feet. This agrees with the description as at time zero, x=0, the y=4 i.e 4ft. After 10 days the plant will be

y=4+10 = 14 or 14 ft tall. Which is a sensible value.

If we compare the equation with the general equation for a straight line which is

y=mx+c

where

m=gradient and

c=the y intercept

we see that m=1 and

c=4 (or the line passes through (0,4)

**Answer this Question**

**Related Questions**

math - The bamboo plant is one of the fastest growing plants in the world. One ...

calculus - A growing boy who is 4 feet tall stands 8 feet from a 12 foot lamp ...

math - If I plant a 7 foot tall tree. The height (h) of the tree, in feet, after...

6th grade - a fast growing mushroom doubled in size every day. after 30 days it ...

Math - A carpenter purchased 25.25 feet of hardwood at $25.20 per foot, and 3 ...

English - Thank you for helping me. I left out the following sentences. 1) ...

Math - A fast growing mushroom doubled in size every day. After 30 days, it ...

Algebra - graph the equation x-3=y (where do I plot the points?) find the ...

math - a building casts a 25 foot shadow on a sunny day. If the angle of ...

Math - If Sally places a rocket that is 3 feet 6 inches tall atop a launch pad ...