Phoebe is correct. The line on the graph would be vertical in the x-axis value of 12.
Two terms are alike when the have the same variable
For example you can’t add apple to bananas
The y intercept is found by putting x = 0 and calculating y, and vice versa.
y intercept:-
3(0) + 8y = 14 ; 8y =14; so y = 14/8 = 7/4
x intercept:-
3x + 8(0) = 14 ; 3x = 14; x = 14/3