what is value of z if the sum of 9z+9=180

180-9=171

9z=171
z=171/9
z=19

To find the value of z, we can solve the equation 9z + 9 = 180 by isolating z.

Step 1: Subtract 9 from both sides of the equation:
9z + 9 - 9 = 180 - 9
9z = 171

Step 2: Divide both sides of the equation by 9:
9z/9 = 171/9
z = 19

Therefore, the value of z is 19.

9z+9=180

9z=171

z=171/9

z=19