Answer:
the third answer
Step-by-step explanation:
f(x) = 3x + 1 works because...
x = 1
y = 4
f(x) = 3x + 1
f(1) = 3x + 1
y = 3x + 1
4 = 3(1) + 1
4 = 3 + 1
4 = 4
AND
x = 2
y = 7
f(x) = 3x + 1
f(2) = 3x + 1
y = 3x + 1
7 = 3(2) + 1
7 = 6 + 1
7 = 7
ETC...
