Triangle lmn is similar to triangle xyz with altitudes kl and wx. find kl

KL is 7.

Since LMN~XYZ, that means m∠N = m∠Z.

Since the angles are the same, we also know that 
sin N = sin Z

Sine is the ratio of the opposite side to the hypotenuse of a right triangle.  The sine of N would be the ratio of sides LK to LN, and the sine of Z would be the ratio of sides XW to XZ.  That gives us:

x/28 = 3/12

Cross multiply the proportion:

12*x = 28*3
12x = 84

Divide both sides by 12:
12x/12 = 84/12
x = 7

There is no graph but what i can say is that 1 is the slope and that -2 is the y- intercept