Answer: -15
Step-by-Step Explanation:
1) Reorder the terms
36-51
2) Use the rule: a-b=-(b-a)
-(51-36)
3) Use the algorithm method
51
-36
——
15
4) After simplification, we have:
-(51-36)=-15
5)Therefore, -51+36=-15
-15
Option D:
is the solution to the system of equations.
Explanation:
Given that the equations are
and 
We need to determine the solution of the system of equations.
The solution can be determined by solving the two equations.
Let us solve the system of equations using substitution method.
Consider the equation
, the value of y is given by

Substituting the value of
in the equation
, we get,

Simplifying, we get,




Substituting the value of
in
, we get,



Thus, the solution to the system of equations is 
Hence, Option D is the correct answer.
the area of the triangle is 36
Bill paints 1/2 per hour. Bob paints 1/3 per hour. 1/2x+1/3x=1