The answer is y=3x.
y=21, x=7
y=mx (m is the variable for slope)
21=m(7)
m=21/7
m=3
(
, 3 )
to calculate the midpoint use the midpoint formula
midpoint = [
(9 + 0),
(- 1 + 7)] = (
, 3 )
<span>[3 - (4 + 32 * 8) ÷ 4]
=</span>[3 - (4 + 4) ÷ 4]
= 3 - 8 ÷ 4
= 3 - 2
= 1