Mr Roberts had 9512 in savings. He saved another 488.00 He then used all his money to buy 500 books. He sold the books for $35.00 each. How much dis Mr. Roberts earn from selling each book

9512 + 488 all divided by 500 = 20.  He spent 20 dollars per book.

If he sold each book for 35, and each book cost him 20, then he made $15 on each book.

Okay.

So he had $9512 and saved another $488 so,

9512 + 488 = 10000

He used that to buy 500 books so,

10,000 / 500 = $20 per book

He then sold the books for $35 each. If he paid $20 per book then $35 - $20 = $15

Mr. Roberts earned $15 per book by sellin

the correct answer is 5 6 and 7

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