Question

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

Answer 1

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:

$5a + 2b = 0$

$5(b - 2) + 2b = 0$

$5b - 10 + 2b = 0$

$7b = 10$

$b = \frac{10}{7}$

7b

$7b = 7\frac{10}{7} = \frac{70}{7} = 10$

7b = 10