Answer :
An equation to model the number of 3-wheel and 4-wheel carts with any wheels left over is 3x + 4y = 60.
Step-by-step explanation:
Let us assume,
- 'x' be the number of 3-wheel carts.
- 'y' be the number of 4-wheel carts.
- Total wheels they had = 60 wheels.
∴ The equation is 3x + 4y = 60, that represents all of the 60 wheels are used to make 3-wheel and 4-wheel carts with no wheels left over.