When you are trying to graph an equation.
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y=mx+b y0=mx0+b 5=3*2+b b=5-5=0 y=3x+0
slopeintercept equations are used to find the slope and intercept (obviously lol) they are set up like this y=mx+b m is the slope and b is the y-intercept lets say you have an equation like... 2x + y = 5 (now minus 2x from both sides) 2x - 2x + y = 5 - 2x (simplify) y = 5 - 2x just use algebra to turn the standard form to slope intercept form
It is used when working out a straight line equation.
I use numbers under ten in written form and over ten in number form. Dates should always be written in number form without the comma. Money is also used in number form. ie. $60 instead of sixty dollars, 1984 instead of nineteen eighty-four as in a year. 1,984 when talking about a quantity of something.
You use standard form in algebra because you have to know the number before you answer the problem