Answer:
x = 9 when y = 39
Step-by-step explanation:
To solve this, we will use a proportion, since x varies directly with y, each will increase proportionately to the other.
3 / 13 = x / 39
Step 1: Cross Multiply
13x = 117
Step 2: Divide both sides by 13
13x / 13 = 117 / 13
x = 9
Step 3: Check
3 / 13 = 9 / 39
117 = 117 ✅
x = 9 when y = 39
