In order to subtract fractions, you need the denominators (bottom number) to be the same.

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Answer:
y= -3/5x+5
Step-by-step explanation:
Step-by-step explanation:
J = 2b
M = J + 7
M = 21
J = 21 - 7
J = 14
B = 7
<em>Equation:</em>
If M is J+7, so then J = 21-7. J is 2*b, so 2*b = 21-7. Then you subtract and divide.
8 + 3(16-12)
8 + 3(4)
8 + 12
20 is your answer
hope this helps