Question

Writing an Equation from a Graph

10
8
*
x
-10 8 6 4
2 4 6 8 10
-2
-6
-8
-10-
Intro
6
Yo
2469 9
Study the graph of the line. Use the drop-down menu
to find its equation.
The equation of the line is
Done

Answer 1

y = x + 2

Explanation:

the equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

calculate m using the slope formula

m =
`(y_(2)-y_(1) )/(x_(2)-x_(1) )`

with (x₁, y₁ ) = (- 2, 0) and (x₂, y₂ ) = (0, 2) ← 2 points on the line

m =
`(2-0)/(0-(-2))` =
`(2)/(0+2)` =
`(2)/(2)` = 1

the line crosses the y- axis at (0, 2 ) ⇒ c = 2

y = x + 2 ← equation of line