By substitution.
3x-y=-13
y=4

(-3,4)

Step-by-step explanation:

3x-y=-13

y=4

Substitute the second equation into the first equation

3x - 4 = -13

Add 4 to each side

3x -4+4 = -13+4

3x = -9

Divide by 3

3x/3 = -9/3

x = -3

(-3,4)

since your problem is x^4 = 81, what you have to undeo is the "to the fourth power" part.

the inverse (opposite operation) of "to the fourth power" is "to the fourth root".

  (x^4) ^ ¼   = 81 ^ ¼  

  81 = 3^4     so (3 ^ 4) ^ ¼   =   3 ^ 1   = 3

by hand: (3 ^ 4) ^ ¼   =   3 ^ (4 x ¼) = 3 ^ 1   = 3   (when you take a power to a power, multiply the exponents.)

or, do it by calculator. one way of finding the fourth root is to use ^ (1/4)

step-by-step explanation: