Question

79+(89-n)=103,б)9z+3z-13=155

Answer 1

79+(89-n)=103
89-n=103-79
89-n=24
-n=24-89
-n=-65
n=65
проверка 79+(89-65)=103
                 79+24=103
                 103=103

9z+3z-13=155
12z-13=155
12z=155+13
12z=168
z=168/12
z=14
проверка 9*14+3*14-13=155
                126+42-13=155
                 155=155

Answer 2

a)

To solve the equation 79 + (89 - n) = 103, we first need to simplify the expression in parentheses by subtracting n from 89:

79 + (89 - n) = 103 79 + 89 - n = 103 168 - n = 103

Next, we can isolate n by subtracting 168 from both sides:

168 - n = 103

• n = -65

Finally, we can solve for n by dividing both sides by -1:

n = 65

Therefore, the solution to the equation is n = 65.

b)

To solve the equation 9z + 3z - 13 = 155, we can combine the like terms on the left-hand side of the equation:

9z + 3z - 13 = 155 12z - 13 = 155

Next, we can isolate the variable term by adding 13 to both sides:

12z - 13 = 155 12z = 168

Finally, we can solve for z by dividing both sides by 12:

12z = 168 z = 14

Therefore, the solution to the equation is z = 14.