So I was tutoring an Algebra 1 student yesterday and we were reviewing the three forms in which one can write the equation for a line: point-slope form, slope-intercept form and standard form. I told him to write an equation in standard form and he wrote:
$\frac x5 + \frac y4 = 1$ and I told him to rewrite it without any fractions as $4x +5y = 20$
Are both forms correct? I understand that the latter form may be more common but what I really want to know is if it is acceptable to use the former. Thanks all!