X+y=5; 4x+y=10 .
part a: use substitution to find the solution to the systems of equations. include all of your work in your final answer.
part b: algebraically verify your answer to part a. include all of your work in your final answer.

Part A: -x+y=5
            +x    +x
             y=x+5
4x+x+5=10
5x+5=10
     -5  -5
5x=5
x=1
1(-x) +y=5
-1+y=5
+1     +1
y=6
The solution is (1,6)
Part B: 
-x+y=5
-1+6=5
5=5
4x+y=10
4(1)+6=10
4+6=10
10=10

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)