1800:X-8=80 (2000+a)=500=3000 1200:(y-600)=400

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To solve these equations:

1) X-8 = 80
Add 8 to both sides to isolate X:
X = 80 + 8
X = 88

2) 2000 + a = 500
Subtract 2000 from both sides to isolate a:
a = 500 - 2000
a = -1500

3) 1200 / (y - 600) = 400
Multiply both sides by (y - 600) to isolate y:
1200 = 400(y - 600)
Divide by 400 on both sides:
3 = y - 600
Add 600 to both sides:
y = 603