PLEASE HELP ME

Multiply each equation by a constant that would help to eliminate the y terms.

2 x - 5 y = -21. 3 x - 3 y = -18.

What are the resulting equations?

A) 6 x - 15 y = -63. -15 x + 15 y = 90.

B) 6 x -15 y = 63. -15 x + 15 y = 90.

C) 6 x - 15 y = -63. -15 x + 15 y = -90.

D) 6 x - 15 y = -63. -15 x + 15 y = 90.

Since the coefficient of y in the left equation is 5 and the coefficient in the right equation is 3, we can simply multiply 3*5 to get 15 and this is what both coefficient would have to be. This means multiplying the first equation by 3 to get 6x-15y=-63 and multiplying the second equation by 5 to get 15x-15y=-90. Notice how we're not done. We need to negate the second equation that way the y-terms will be eliminated. So the second equation must be -15x+15y=90. So the correct choice is A.

Hope this helped. Feel free to message me with any more questions.

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:

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