Exactly. Using mathematics in a linear equation is really only possible in a 1 or 2 dimensional phrase. For instance:
x + 2y = 10,
3a + 472b = 10b = 37,
2x + y - 5 = -7 + 4y + 3.
In a 2 dimensional general form we see:
Ax + By + C = 0
In this we call A and B equality to zero
We could also explore Standard, Slope, Intercept, etc.