An office supply store recently sold a black printer ink cartridge for $17.99 and a color printer ink cartridge for $23.99. At the start of a recent fall semester, a total of 52 of these cartridges was sold for a total of $1007.48. How many of each type were purchased?

step-by-step explanation: examine the two-step equation.

−  

7

4

+  

x

4

= 2

which property of operations allows you to add the same constant term to both sides?

multiplication property of equality

division property of equality

addition property of equality

subtraction property of equality

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: