+334 Find the distance between the $x$-intercept and the $y$-intercept of the graph of the equation $3x - 7y = 21$.
+36916 Put in x = 0 calculate y this is the y -axis intercept (0,y)
Put in y = 0 calculate x this is the x axis intercept (x,0)
Then use distance formula to calculate the distance between the two points ......
