5.60 divided by 4 is 1.40$
The unit is 1.60
685-85=600
1 year =12 months
12 multiply by 2 =24
600 divided by 24=25
answer=25
Given:

Find the method .
Sol:

2eq(1) + eq(2) then,

Then apply the elimination method.
Answer:
y = - x + 9
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, 9) and (x₂, y₂ ) = (9, 0) ← 2 points on the line
m =
=
= - 1
the line crosses the y- axis at (0, 9 ) ⇒ c = 9
y = - x + 9 ← equation of line