Give the system, X + y = 15 3x - y = 9, find the value of x and y

(x,y)=(9/77,684/77)

Step-by-step explanation:

X + y = 15 3x - y = 9

=154x=18

x=9/77

9/77+y=9

y=684/77

=(x,y)=(9/77,684/77)

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.

w'x is 0.

hope it