6b +20 equals a and 4b +30 equals a b equals?

b=5

Step-by-step explanation:

So, they basically equal each other since they both equal a.

6b+20=4b+30

Your first step is to move the variable to one side, by that I mean to subtract. You have to subtract the smallest number that has a variable, in this case it would be 4b.

6b+20= 4b+30

-4b        -4b

Once you have subtracted the variable, and now that there is only one variable in the equation, you have to subtract 20, since that is the opposite of adding.

2b+20=30

     -20 -20

Then, you have to divide 2 from 10, since that is the opposite of multiplying.

2b=10

2    2

Conclusion- b=5

step-by-step explanation:

answer:

c) the x-coordinate of the center of the circle increases by 3