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Helen [10]
3 years ago
6

The table shows the height of a flower as it grows. What equation in slope-intercept form gives the flower's height at any time?

Mathematics
2 answers:
tester [92]3 years ago
8 0
Use the table to draw the graph of height(y-axis) against week(x-axis).
The graph is a straight line. 
Find the gradient of the graph as the first step.
Gradient = (y2-y1)/(x2-x1)

              = (17-12)/(4-2)
              = 5/2
Use this gradient to find the equation of the line. Use one of the point from the table (e.g. (8,27)) and another general point (x,y).

∴5/2=(y-27)/(8-x)
   5/2 (x-8) = y-27
    (5/2)x - 20 = y-27
    
   y=(5/2)x - 20 + 27

  y = (5/2)x + 7

The answer is A
   



kobusy [5.1K]3 years ago
5 0
Answer:
y = \frac{5}{2} x + 7

Explanation:
The general form of the linear equation is:
y = mx + c
where:
m is the slope
c is the y-intercept

1- getting the slope:
slope can be calculated as follows:
m = \frac{y2 - y1}{x2 - x1}

I will use the points (2,12) and (8,27) to get the slope. You can choose any other two points and you will get the same answer.
m = \frac{27-12}{8-2} =  \frac{5}{2}

The equation of the line now is:
y = \frac{5}{2} x + c

2- getting the y-intercept:
To get the y-intercept (c), we will use any of the given points, substitute in teh equation and solve for c.
I will use the point (6,22) as follows:
y = \frac{5}{2} x + c

22 = \frac{5}{2} (6) + c

22 = 15 + c
c = 7

Based on teh above, the equation of the line is:
y = \frac{5}{2} x + 7

Hope this helps :)
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Llana [10]
4 unknowns needs 4 equations. I'll call the unknown numbers a,b,c,d in that order left to right.

4 + a = b
a + b = c
b + c = d
c + d = 67

let's use substitution to get rid to combine equations and get rid of variables.
If a + b = c then a = c - b
4 + (c - b) = b
4 + c = 2b

If b + c = d then b = d - c
4 + c = 2(d - c)
4 + c = 2d - 2c
4 + 3c = 2d

then we have c + d = 67 so c = 67 - d

4 + 3(67 - d) = 2d
4 + 201 - 3d = 2d
205 = 5d
d = 41

Should be easy now, subtract backwards.

67 - 41 = 26
41 - 26 = 15
26 - 15 = 11
15 - 11 = 4

4, 11, 15, 26, 41, 67


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