Answer:


Step-by-step explanation:
Look at the second equation.
Add 6y to both sides:

Hence,

Substitute this into first equation:



Since y = -x,

Commutative property allows you to change the order of the terms when adding or multiplying without changing the outcome.
Answer:
total # books read = b + 16
Step-by-step explanation:
<span>Given the SAS, we can use the CPCPT (congruent parts of congruent triangles are congruent) and get the ASA. </span>
Answer: n = 4
Step-by-step explanation:
The given expression is
2n+4=12
We want to solve for n. The first step is to make 2n stand alone on the left hand side of the equation. This is achieved by subtracting 4 from the left hand side and the right hand side of the equation. It becomes
2n + 4 - 4=12 - 4
2n = 8
The next step is to divide the left hand side and the right hand side of the equation by 2. It becomes
2n/2 = 8/2
n = 4