Step-by-step explanation:
everything can be found in the picture
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Answer:

Step-by-step explanation:

Move 3k to left hand side and change it's sign
Similarly, move 4.5 to right hand side and change it's sign

Collect like terms

Subtract 4.5 from 18

Divide both sides by 4.5

Calculate

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Answer:
let cow=x and chickens =y
cows have 4 legs, 4x. chickens have 2 legs, 2y
Answer:
The garden is 4.5 ft by 6 ft.
Step-by-step explanation:
2x + 2(x+1.5) = 21
2x + 2x + 3 = 21
4x = 18
x = 4.5