Answer:
x=9
Step-by-step explanation:
Plug in 8 for f(x)
8=2x-10
Isolate the x term by moving the 10
18=2x
Isolate the variable
9=x
translate 2 down and 5 to the righf
Equation: 21 = -3 + x
+3. +3
24 = 0 + x
24=x
The second number is 24.
Hope I helped