See screenshot...need help its due today

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Given the equation y − 4 = three fourths(x + 8) in point-slope form, identify the equation of the same line in standard form. −three fourthsx + y = 10 3x − 4y = −40 y = three fourthsx + 12 y = three fourthsx + 10

How do you determine if an ordered pair is a solution to a given equation?