Find the x and y of x-3y=15 and -2x-4y=10

Use elimination to create a one variable equation.

 x-3y=15 -> 2x-6y=30

   2x-6y=30

+(-2x-4y=10)

-10y=40

Then solve (for y in this case).

y=-4

Now we can use the value for y to solve for x.

x-3y=15 -> x-3(-4)=15 -> x=3

go on the tube you might find some information there

(f - g)(x) = 5x^3 - 3

step-by-step explanation:

rearrange these functions vertically, with like terms in separate columns:

f(x) = 5x^3 - 2

g(x) =         +1

now subtract, column by column:

(f - g)(x) = 5x^3 - 3