Without more info you cannot answer this question numerically. What is the given value of x?
Let's write y = 5x + 7 as a function: f(x) = 5x + 7.
Now if x=1, f(1) = 5(1) + 7 = 12
If x= -10, f( -10) = 5(-10) + 7 = -50 + 7 = -43
and so on.
The given function is represented by the straight line graph through (0, 7) with slope of 5.