Question

What is the value of the y variable in the solution to the following system of equations?
2x + y = 5
x + 3y = 0

Answer 1

Given 2x + y = 5....(1)
x + 3y = 0 ….......(2)
multiply by 3 in equation (1) an subtract from (2)
=>6x+3y=15......(1)
=>x+3y=0.......(2)
- - -
------------------------
5x=-15
=>x= -3
substitute x value in equation (1)
=>2(-3)+y=5
=>-6+y=5
=>y=5+6
=>y=11

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