Answer:
y = -
x + 7
Step-by-step 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 = 
with (x₁, y₁ ) = (0, 7) and (x₂, y₂ ) = (4, 2) ← 2 points on the line
m =
=
= - 
The line crosses the y- axis at (0, 7 ) ⇒ c = 7
y = -
x + 7 ← equation of line