1) x=4y
x+y=25
4y+y=25
5y=25
y=5
2) y=4-3x
5x-2y=14
5x-2(4-3x)=14
5x-8+6x=14
5x+6x=14+8
11x=22
x=2
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Answers & Comments
1) x=4y
x+y=25
4y+y=25
5y=25
y=5
2) y=4-3x
5x-2y=14
5x-2(4-3x)=14
5x-8+6x=14
5x+6x=14+8
11x=22
x=2