Answer:
2
Step-by-step explanation:
The second option.
3x + 6 = 21.
If x = 5, plug it in.
3 · 5 + 6 = 21
15 + 6 = 21
Hope this helps,
Davinia.
y = 1/2x - 7
y = 1/2x + b
-4 = 1/2(6) + b
-4 = 3 + b
-7 = b
(3,2) is the solution