obeyyjenny123 obeyyjenny123
  • 01-08-2018
  • Mathematics
contestada

What is the value of a in the equation 5a – 10b = 45, when b = 3?

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choixongdong
choixongdong choixongdong
  • 01-08-2018

5a – 10b = 45

Substitute b = 3 into the equation

5a – 10(3) = 45

5a - 30 = 45

5a = 75

a = 15

Answer: a = 15

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BiologiaMagister
BiologiaMagister BiologiaMagister
  • 01-08-2018

If b = 3 you substitute al the b's on the equation by 3:

5a - 10(3) = 45 - you substitute b for 3

5a - 30 = 45 - you do 10 * 3

5a = 45 + 30 - you move 30 to the right side of the equation

5a = 75 - you do 45 + 30

a = [tex] \frac{75}{5} [/tex] - you take 5 to the right side of the equation

a = 15

Hope it helped,

Happy homework/ study/ exam!

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