Q1.x+y = 4 , 2x +y =4 solve by elimination method.
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Explanation:
x+y= 4
2x+y= 4
How to solve ?
step 1: Firstly make the coefficient same of any Variable of both Equation.
step 2: Change the sign and substract it we'll obtain a value which could be put into another equation to find out other value.
=>x+y= 4-----× 2 ￣➊
2x+y = 4------× 1 ￣➋
In order to make the coefficient same of one variable Multiply 2 with Equation 1 and 1 with Equation 2.
New Equation obtained
=> 2x+2y= 8
=> 2x+y= 4
=> (-)(-)\:(-)(−)(−)(−)
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y= 8-4
y= 4
Now, put y into Equation 1
=> x+y=4
=> x+4=4
=>x = 0
x=0
Check
=> 2x+y= 4
=>2(0)+4
=>0+4= 4
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