The first equation is:
This linear equation is written in y intercept form because we know that -3 is the y intercept of the equation. We can rest -2x in bout sides of the equation so we well have the slope intercept form, where we know that -2 will be the slope of the equation and again the -3 is the y intercept. And finally we can get a comon factor of 2 so the new equation will be in hte standart form.