Please solve the combination of equations here.

Step-by-step explanation:

We are going to do a replacement of x for a second equation

So instead

in the place of x we are putting 12-y from the first equation, so

To leave the brackets we need to do multiplication

Which is

How to determine x? From the first equation:

If the x +y = 12 then the x = 12-y so x = 12-7 = 5

We should write solution as a pair:

costs the what? what is the cost of the pants?

step-by-step explanation:

if it is $10, then the price is 14.

take 40% of the cost, and then add the cost.

40% of 10 = 4

4+10 = 14.