Martin earns a base salary and a commission on each new policy, so Martin's weekly income(I), depends on the number of new policies(n), he sells during the week. Last week he sold 4 new policies and earned $680 for the week. The week before, he sold 7 new policies and earned $950. a) Find an equation for I(n). then interpret the meaning of each component
b) What would be his income for the week during which he sold 9 new policies?

is only a line? i think so

12cm

the answer is d

5x + 3y = - 4

step-by-step explanation:

the equation of a line in standard form is

ax + by = c ( a is a positive integer and b, c are integers )

express the line first of all in slope- intercept form

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

to calculate m use the gradient formula

m = ( y₂ - y₁ ) / ( x₂ - x₁ )

with (x₁, y₁ ) = (7, - 3) and (x₂, y₂ ) = (4, - 8)

m = = -

y = - x + c ← is the partial equation

to find c substitute either of the 2 points into the partial equation

using (4, - 8 ), then

- 8 = - + c ⇒ c = -

y = - x - ← in slope-intercept form

multiply all terms by 3 to eliminate the fractions

3y = - 5x - 4 ( add 5x to both sides )

5x + 3y = - 4 ← in standard form