Subtract 12x from 84x = 72x
3x-4y=10
-20-x+2y=10 then -30+2y=x now plug this in the other equation:
3(-30+2y)-4y=10
-90+6y-4y=10
2y=100
y=50
Answer:
9

Step-by-step explanation:
Find what both expressions have in common
Answer:
3.√
4.√
Step-by-step explanation:
similar rectangles have proportional sides so compare corresponding sides to check
1. 169/1.3 = 49/0.7 → 130 ≠70 no
2. 18.55/5.3 = 10.5/3.5 → 3.5 ≠ 3 no
3. 120/24 = 60/12 → 5 = 5 yes
4. 189/2.1 = 81/0.9 → 90 = 90 yes