Mathematical substitution - Training Enrollment Network

Mathematical substitution

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3x+y=3

4x-y= 1 1

From 4x-y= 1 1.

y=4x- 1 1

Substitute y=4x- 1 1 into 3x+y=3.

3x+(4x- 1 1)=3

3x+4x= 14

x=2

Substitute x=2 into 4x-y= 1 1.

8-y= 1 1

y=-3

x=2，y=-3

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