2/3 (two-thirds) because for 3 gallons you use 2 cups so you divide by three to get one gallon and 2 divided by 3 is two-thirds.
1/2 = 3/6
Then you add 1/6
After that you do 6/6 minus 4/6 which then leads to the answer2/6
2(x-3)=2x-6 then add 4 = 2x-2
The top one on the left is equivalent to the second one down on the right; the second one down on the left is equivalent to the bottom one on the right; the third one down on the left is equivalent to the second one down on the right, and the last one on the left is the only one remaining on the right.
.
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is then 
, so the tangent to 
has slope
