Neil has total of 8 cars and trucks as toys. For his next birthday, he wants to double the number of cars he has. He will then have a total of 11 toy vehicles. How many of each type does he have now?

Number of cars = 3

Number of trucks = 5

Step-by-step explanation:

Let

Number of cars = x

Number of trucks = y

Total number of cars and trucks = 8

We can write the equation:

For his next birthday, he want to double the cars.

The number of cars will be: 2x

Now, the total number of cars and trucks will be 11

Now equation will be:

Now, Solving these equations, we can find value of x and y

Subtracting both equations:

So, we get x =3

Now, for finding value of y, put value of x in equation 1:

So, we get y=5

So,

Number of cars = x = 3

Number of trucks = y = 5

b.an increase in a causes b to decrease