6/10 and 12/20 are both equivalent to 3/5
If this is for slope-intercept, the equation is: y = 3x + 1
To find the slope, you would find the rise over run ( 
). So, you would start where the graph intersect at the y-axis, which is 1. You would go up 3 times, and right 1 time. So, 
, or 3, would be your slope. To find the y-intercept, you would need to find where the graph intersects at the y-axis, which is 1, so it would be your y-intercept. Plug them into the y = mx + b formula and the answer is <em>y = 3x + 1</em>.
If you have any further questions, please reach out to me :)
Markup = $4
b) markup as a percentage of cost is 33.3%
Step-by-step explanation:
Markup
markup = selling price - cost
= $13 - 9
... markup = $3
Markup as a Percentage of Cost
To find the percent markup, divide the markup by the reference value and multiply the ratio by 100%. The reference value for markup is usually cost price, but sometimes may be selling price.
... markup / cost × 100% = 3/9×100% = 33 1/3% ≈ 33.3%
