Please help me!! What’s the angle for X , Z ,A

Next time include the entire question please; we're guessing here.

XZA and ZXL are alternate interior angles   assuming we're told XL and AZ are parallel.  Alternate means on opposite sides of the transversal; interior means between the parallel lines.

If that 123 degrees is indicating angle ZXL it also is the value for angle XZA because alternate interior angles are congruent.

angle XZA = 123°

the direct variation says that:

then the equation is of the form is given by:

            where k is the constant variation.

from the given table:

consider any value of x and m(x)=y

x = 2 and m(x)=y = 3

substitute these value in [1]; we have;

divide both sides by 2 we get;

⇒

check:

put x = -1 and m(x) = -1.5

substitute in the equation:

-1.5 = -1.5                   true

therefore, the function m(x) represents a direct variation

graph of this function as shown below: