Abc bookstore sells one customer 12 used books and 4 new books for $120.
another customer buys 14 used books and 2 new books for $100. how much
is one used book (u), and one new book (n)?

One used book cost 5$ and a new book cost 15$

Step-by-step explanation:

lets multiply the second equation ×(-2)

×

if u = 5 then from equation 1

12*u + 4n = 120, 60 +4n = 120, 4n=120-60, n=60/4, n=15

a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.

it is not that hard all u have to do is plot the graph

step-by-step explanation: