- Slope formula:

Firstly, let's set up our equation. Place the two coordinates in the slope formula and have it equal 8: 
Next, combine like terms: 
Next, multiply both sides by 7: 
Next, add 4 onto both sides of the equation: 
Lastly, divide both sides by 2 and <u>your answer will be
</u>
He puts 15 markers in the box. Hope this helps.
50% off means half price, so half of 49.98 is 24.99
the necklace now costs 24.99 dollars