Please help me if you can. Please also write how you got the answer thank you.

Bob is 5

Equation = 2x + 2 = 8

Step-by-step explanation:

Let's assign some expressions;

Sister = x

Bob = x+2

Bob + Sister = 8

Now, substitute with the expressions:

Bob + Sister = 8 =

x + x + 2 = 8

Now simplify and solve the equation:

2x+2=8

x = 3

Sister = 3, Bob = 5

y=−9/2x+10

step-by-step explanation:

let's solve for y.

0−9x−2y=−20

step 1: add 9x to both sides.

−9x−2y+9x=−20+9x

−2y=9x−20

step 2: divide both sides by -2.

−2y

−2

=

9x−20

−2

y=

−9

2

x+10