85 + 215 = 40 * 30 = 70
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8/15 − 2/5 = 2/15
(- 2, 15) and (- 8, - 5)m = Y2 - Y1/X2 - X1m = - 5 - 15/- 8 - (- 2)m = 10/3=======
4/5 * 2/3 = (4*2)/(5*3) = 8/15
8/12 and 2/5 can be expressed as 2/3 and 2/5. The LCM of 3 and 5 is 15. Hence 2/3 and 2/5 may be represented with the common denominator 15 as 10/15 and 6/15. Since 10/15 is greater than 6/15, 2/3 is greater than 2/5 and so the original 8/12 is greater than the original 2/5
Find the lowest common denominator and convert the whole numbers to fractions, then do the subtraction and convert back to lowest terms. 10+1/5=51/5=153/15 and 4+2/3=14/3=70/15 153/15 - 70/15 = 83/15 = 5+8/15 (five and eight fifteenths)