Question 263166
y = mx+b
y = -4x + b
.
We're told one point on the line:  (4,8)
So, when x=4, y = 8
Substituting,
8 = -4(4) + b
8 = -16 + b
24 = b
b = 24
.
y = -4x + 24
.
x = 0, y = 24
x = 6, y = 0
.
Check the graph
{{{graph(500,500,-30,30,-30,30,-4*x+24)}}}
.
Done