7s + 20 = 4s -13
7s - 4s = -13 -20
3s = -33
s = -33/3
s = -11
You can just multiply the 0.45 grams by 10,000. Just keep moving to decimal to the right.
0.45 * 10000 = 4500
<span> A vertical line has undefined slope because all </span>points<span> on the line have the same </span>x-coordinate<span>. As a result the </span>formula <span> used for slope has a </span>denominator<span> of 0, which makes the slope undefined..
So the answer would be "vertical"
</span>