I'm Sorry I can't answer the question because it's messed up and I haven't learned that yet

Maybe you can try another app

(1) let there be x book and let the total cost be y dollars.

y=19.25x+40

y=16x+69.25

(2) 19.25x+40=16x+69.25

3.25x=29.25

x=9

9 silver book, 9 gold book.

(3) y=19.25x+40=19.25*9+40=213.25 dollars

both companies' total cost are 213.25 dollars.

**Answer:**

you have to calculate 30 by6

**Step-by-step explanation:**

30 x 6=57

**Answer:**

Not

**Step-by-step explanation:**

In this case, the degree of variable y is 1 , the degrees of the variables in the equation violate the linear equation definition, which means that the equation is not a linear equation.