Question

tom has a collection of 30 cds and nita has a collection of 18 cds. tom is adding 1 cd a month to his collection while nita is adding 5 cds a month to her collection. write a system to find the number of months after which they will have the same number of cds. let x represent the number of months and y the number of cds. a. y = –x 30 y = 5x 18 2 months b. y = x 30 y = 18x 5 1 month c. y = x 18 y = 5x 30 33 months d. y = x 30 y = 5x 18 3 months

Answer 1

Tom has 30, and adding 1 CD a month.

After x months Tom would have had:   30 + x*1 =  30 + x,    y = 30 + x

Nita has 18, and adding 5 CDs a month.

After x months Nita would have had:   18 + x*5 =  18 + 5x,  y =  18 + 5x,


Solving the equation:

y = 30 + x,  y =  18 + 5x

30 + x = 18 + 5x

x - 5x = 18 - 30

-4x = -12

x = -12/-4

x = 3,      So after 3 months they would both have equal number.


System of equations:  y = 30 + x,   y =  18 + 5x,      will have same number after 3 months.

Answer 2

Answer: y= 30+x , y=18+5x

Step-by-step explanation:

Given:- Tom has a collection of 30 cds and Nita has a collection of 18 cds. Tom is adding 1 cd a month to his collection while Nita is adding 5 cds a month to her collection.

Let x represent the number of months and y the number of cds.

Then the number of cds collected by Tom after 'x' months (y)=30+1×x

⇒y=30+x

The number of cds collected by Nita after 'x' months (y)=18+5×x

⇒y=18+5x