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21 votes
21 votes
Find the equation of the line.

Use exact numbers.
100+
y
8+
7+
6+
9 8 7 6 5 4 3 2
2 3 4 5 6 7 8 9
-3
-4
-5
-6+
-7
-8

Find the equation of the line. Use exact numbers. 100+ y 8+ 7+ 6+ 9 8 7 6 5 4 3 2 2 3 4 5 6 7 8 9 -3 -4 -5 -6+ -7 -8-example-1
User Edoardo Pirovano
by
2.8k points

1 Answer

7 votes
7 votes

Answer:

The equation of the line is:


y = 3x+3

The graph is also attached.

Explanation:

The slope-intercept form of the line equation

y = mx+b

where

  • m is the slope
  • b is the y-intercept

From the straight line on the graph, taking two points

  • (0, 3)
  • (-1, 0)

Finding the slope between (0, 3) and (-1, 0)

Using the formula

Slope = m = [y₂ - y₁] / [x₂ - x₁]

= [0 - 3] / [-1 - 0]

= -3 / -1

= 3

Thus, the slope of the line = m = 3

We know that the value of y-intercept can be determined by setting x = 0, and determining the corresponding value of y.

From the graph, it is clear

at x = 0, y = 3

Thus, the y-intercept b = 3

Now, substituting slope m = 3 and y-intercept b = 3 in the slope-intercept form

y = mx+b

y = 3x+3

Therefore, the equation of the line is:


y = 3x+3

The graph is also attached.

Find the equation of the line. Use exact numbers. 100+ y 8+ 7+ 6+ 9 8 7 6 5 4 3 2 2 3 4 5 6 7 8 9 -3 -4 -5 -6+ -7 -8-example-1
User Jakim
by
3.1k points