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x+y = 2y-7
x + y = x + y
2 - y = 2y - 7
2+7 = 2y+y
3y = 9
→ y = 3
2) 2x = y - 5
→ y = 2x + 5
2x + 3y = 7
2x + 3(2x + 5) = 7
8x = 7 - 15
8x = -8
x = -1
y = 3
hp = { -1, 3 }
3) 3x = y - 1 ( dikali 2)
6x = 2y - 2
y + 2 = 2y - 2
2+2 = 2y - y
y = 4
3x = 4 - 1
x = 1
hp = { 1, 4 }
4) y = 7x + 8
3x + 7x + 8 = 58
10x = 58-8
x = 50/10
→ x = 5
5) 5x = y + 7
y + 7 -3y = -9
y - 3y = -7 - 9
-2y = -16
→ y = 8