To figure out a special number, Tammi’s mother was supposed to double her age and then add 4. Instead, Tammi’s mother added 4 to her age and then doubled that number. Tammi’s mother thought the special number was 80. What was the special number supposed to be?

86

Step-by-step explanation:

36 + 4 = 40 x 2 =80

36 x 2 = 82 = 4 - 86

14

step-by-step explanation:

14 x 3 = 42

the solution is the point

step-by-step explanation:

we have

> equation a

> equation b

adds equation a and equation b

substitute the value of x in equation b to find the value of y

the solution is the point