A washing machine is filling up with water at a constant rate. The rate is Three-fourths of a gallon in StartFraction 1 over 5 EndFraction of a minute. Don calculated the unit rate to be StartFraction 3 over 20 EndFraction of a gallon per minute. What did he do wrong? He added Three-fourths to StartFraction 1 over 5 EndFraction instead of multiplying Three-fourths by StartFraction 1 over 5 EndFraction.
He divided Three-fourths by StartFraction 1 over 5 EndFraction instead of multiplying Three-fourths by StartFraction 1 over 5 EndFraction.
He added Three-fourths to StartFraction 1 over 5 EndFraction instead of dividing Three-fourths by StartFraction 1 over 5 EndFraction.
He multiplied Three-fourths by StartFraction 1 over 5 EndFraction instead of dividing Three-fourths by StartFraction 1 over 5 EndFraction.

step-by-step explanation:

i think something is missing in your question because y-1=(x-12) would not pass through the point (-4,-3). because if you replace x by -4 your are supposed to find y=-3 which is not the case her. if you replace x by -4 you find =-15.

i assume the right equation is y-1=1/4*(x-12) because this one is passing through both your points (if you are interested to know how i found that out i can tell you).

in this equation if i replace x by -4 i find y=-3 and if i replace x by 12, i find y=1 so the line representing this equation is passing through those 2 points.

then the standard form of the equation is finding an expression of y in function of x

y-1=1/4*(x-12)

y=x/4-3+1

y=x/4-2

hope that .

do you confirm there was a mistake in the question?

you would make 33% into a decimal, which is 0.33 cents. add it to the   discounted price (aka $28.38). the answer is $28.71