Mathematic question urgent

The number of integers solutions of the equation 7x + 3y = 123, such that x,y>0 and x
A) 5
B) 6
C) 4
D) 2

draw line 7x+3y=123 and y = x, find integer values of x and y that are on the line 7x+3y=123, to the right of y-axis and to the left-above of y = x,
there are 4 solutions
(3,34)(6,27)(9,20),(12,23)
so answer is (C)

4 solutions
1) 3, 34
2) 6, 27
3) 9, 20
4) 12, 13

C

4

B

it's 4

(3,34) (6,27) (9,20) (12,13)

i think a