Answer:
Step-by-step explanation:
Let the boy's present age be x.
Let his dad's present name be y.
Last year, his dad was 8 times as old as him. Subtract one year from each their ages and multiply the son's age by 8:
(y - 1) = 8(x - 1) ______ (1)
Now, his dad's age is the square of his age:
y = _________(2)
From (1):
y = 8x - 8 + 1
y = 8x -7
Put this in (2):
This problem has been represented in the form of a quadratic equation.
Answer:
Step-by-step explanation:
you
60 +14*number of weeks
sister
120+10*number of weeks
let x be the number of weeks until they have the same amount of money
60+14x = 120+10x ; isolate like terms
14x -10x = 120-60
4x = 60; divide both sides by 4
x= 15 weeks
120+10*15 = 120+ 150 = $270 will be the amount they will have the same
Answer:60
Step-by-step explanation:
D : y = ax + b
a = (-8 + 7) / (-9+ 1) = 1/8
D : y = (1/8)*x + b
-7= (1/8)*(-1 ) + b
b = (1/8)*(-1 ) + 7 = -55/8
D : y = (1/8)*x - (55/8)