1 72x + 3y= 53
2 -4x + 10y= 29
We are going to multiply our second equation by 18, in order to change the coefficient of x .
2 18*-4x + 18*10y= 29*18
2 -72x + 180y = 522
Then we add the last equation to the first equation
1 72x + 3y= 53
+
2 -72x + 180y = 522
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183 y = 575
y= 575/183
Solving for y we get y= 3.14
Then we replace y in the equation 2 to get x. but first we need to isolate x
2 -4x + 10y= 29
2 -4x = 29 - 10y
2 x = (29 - 10y)/-4
2 x = 0.605
The final answer must be ( 0.605 , 3.14 )
