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Sagot :
Answer:
{y,x}={6,3}
Explanation
System of Linear Equations entered :
[1] y=2x
[2] 5x-y=9
Equations Simplified or Rearranged :
[1] y - 2x = 0
[2] -y + 5x = 9
Graphic Representation of the Equations :
-2x + y = 0 5x - y = 9
Solve by Substitution :
// Solve equation [1] for the variable y
[1] y = 2x
// Plug this in for variable y in equation [2]
[2] -(2x) + 5x = 9
[2] 3x = 9
// Solve equation [2] for the variable x
[2] 3x = 9
[2] x = 3
// By now we know this much :
y = 2x
x = 3
// Use the x value to solve for y
y = 2(3) = 6
Solution :
{y,x} = {6,3}
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