Help pls i will mark brainleastly thingy

The equation y=mx+b is the slope-intercept form of the equation of a line. what is the equation solved for b? y-m=b y-mx=b y/mx=b y/m-x=b

State if the two triangles are congruent. if they are, state how you know?

Solve for n? [tex]z = \frac{3}{4} mn[/tex]