All cds in the store were marked either $12 or $10. the counter at the exit of the store says that 500 people left with cds during the sale, and the cash register contains $5750 from the days sales. maria wrote a system of equations for the number of $10 cds and the number of $12 cds

answer: 180

step-by-step explanation:

12-2=10

20-2=18

10x18=180

associative property of multiplication

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?