vammsgamingandvlogch vammsgamingandvlogch
  • 24-06-2020
  • Mathematics
contestada

If $5a+2b=0$ and $a$ is two less than $b$, what is $7b$?

Respuesta :

joaobezerra joaobezerra
  • 30-06-2020

Answer:

7b = 10

Step-by-step explanation:

We have that:

5a + 2b = 0

a is two less than b

So a = b - 2.

Replacing in the above equation:

[tex]5a + 2b = 0[/tex]

[tex]5(b - 2) + 2b = 0[/tex]

[tex]5b - 10 + 2b = 0[/tex]

[tex]7b = 10[/tex]

[tex]b = \frac{10}{7}[/tex]

7b

[tex]7b = 7\frac{10}{7} = \frac{70}{7} = 10[/tex]

7b = 10

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