Question

" align="absmiddle" class="latex-formula"> x -y = -3 what is this in standard form

Answer 1

There are a few different standard forms for a line, let's assume we're after

$ax + by = c$

Let's write

$\frac 3{10} x - y = -3$

That's already in standard form and we could stop. Or we could multiply by 10.

$3 x - 10 y = -30$

We can bring the constant to the same side; some people prefer that as standard form:

$3x - 10 y + 30 = 0$

There's also slope intercept form,

$y = \frac 3 {10} x + 3$

Plenty more forms where these comes from.