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Rohan Glenn
Mathematics
7 January, 21:50
X+2y=-1 and 4x-4y=20 solve by substitution
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Clark Mcgee
7 January, 22:04
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To do this problem you would first need to factor out a variable, which in this case I would want to do the first equation because it is isolated. Now the equations would look like this:
x = - 2y - 1
4x - 4y = 20
Since we know that x is now equal to - 2y - 1 we can plug it in to the x value in the second equation:
4 (-2y - 1) - 4y = 20
-8y - 4 - 4y
-12y - 4 = 20
-12y = 24
y = - 2
Now that we know the y value plug the y value to one equation to find the x, I will be using the first equation
x + 2 (-2) = - 1
x - 4 = - 1
x = 3
Solutions:
y = - 2
x = 3
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