Andrea, Justin, and Virginia went to an office supply store. Andrea bought 6 pencils, 7 markers, and 8 erasers. Her total was $15.75. Justin spent $16.75 buying 6 pencils, 8 markers, and 5 erasers. Virginia bought 5 pencils, 5 markers, and 7 erasers for $11.75. What is the cost of each item?

Step-by-step explanation:

Let denotes number of pencils, markers, erasers respectively.

For Andrea:

For Justin:

For Virginia:

On subtracting equations (i) and (ii), we get

Put in equation (i)

Put in equation (iii)

Multiply equation (iv) by 5 and equation (v) by 6 and then subtract both the equations.

Put in equation

Put in equation (i)

b

step-by-step explanation:

calculate the scale factor as the ratio of corresponding sides, image to original, that is

scale factor = = = = 1

the 2 figures are congruent bc if you reflect abcd over the y axis then over the d axis the figures overlap