Robert's father is 4 times as old as robert. after 5 years, father will be three times as old as robert. what is their present ages of robert and his father respectively

Robert's present age is 10 years

Robert father's present age is 40 years

Step-by-step explanation:

Let r = Robert's current age

Let y = Robert father's current age

Robert's father is 4 times as old as robert. This means that

y = 4x

After 5 years, Robert's father will be three times as old as Robert. This means that

y + 5 = 3(x+5)

y + 5 = 3x + 15 - - - - - - - ;1

We will substitute y = 4x into equation 1. It becomes

4x + 5 = 3x + 15

Collecting like terms,

4x - 3x = 15 - 5

x = 10

y = 4x

Substituting x = 10,

y = 4× 10 = 40 years

3.4 pizzas

step-by-step explanation:

given is a scatter plot showing number of pizzas sold during weeks for different issues of coupon

y represents number of pizzas sold and x number of coupons issued

y is marked verticaly and x horizontally

the trend line is given as

y =3.4x+43

this says that even when no coupon is issued pizzas sold will be 43

and rate of change of pizza sold for 1 unit of coupon = slope = 3.4

i.e. when x increases by 1 unit y increases by 3.4 units

hence for each additional coupon issued 3.4 pizzas more will be sold

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step-by-step explanation:

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