-
Make the two fractions have common denominators. 9 and 12 both fit into 36, so multiply
the top and bottom of
by 4 and
by 3.
⇒
⇒
Now that both fractions have common denominators, you can subtract them easily. Subtract the numerators (8 - 21) and keep the denominators the same.
-
=
a = -13b = 36
Answer:
21
Step-by-step explanation:
Multiply 7 by 3 to get the number that if you divide it by 3 will give 7 which in this case is 1 according to the ratio provided.
7r=-7/2
divide both sides by 7 to get r by itself
(7r)/(7) = (-7/2)/(7)
if you don't quite see it, think of multiplying both sides by 1/7 instead (its the same thing as dividing by 7)
(7r)*(1/7)=(-7/2)*(1/7)
r=-1/2
The answer is D because on the x axis the number is 8 and on the y axis the number is -8
