An office supply company orders packs of pens for two of its stores. for the first store, the order is for 60 packs of ballpoint pens and 25 packs of gel pens, for a total of $355. for the second store, the order is for 120 packs of ballpoint pens and 30 packs of gel pens, for a total of $570. create and solve a system of equations to determine the cost of one pack of ballpoint pens and one pack of gel pens

The cost of a one pack of ballpoint pens is $3 and the cost of one pack of gel pens is $7.

Step-by-step explanation:

Let x be the cost of a one pack of ballpoint pens and y be the cost of one pack of gel pens.

Then by considering the given description in question , we have the following system of equations:-

Multiply equation (1) by 2 on both the sides , we get

Eliminate equation (2) from (3) , we get

Put y= 7 in (1), we get

Hence, the cost of a one pack of ballpoint pens is $3 and the cost of one pack of gel pens is $7.

here you hope this .

step-by-step explanation:

hypotenuse = √(15² + 8²)

=  √(225 +64)

=  √(289) = 17

sin(x) = cos(y) = 8/17

they are identical so long as you are doing the sine of one angle and the cosine of the only other angle that isn't the right angle.