Two people. tom and marcy have combined age of 115 years. the differences in their age is 5 years. what is the age of each person? slove using a system of equations where: x= toms age y= ? equations ? + ? =? ? +? =

Marcy is 55, Tom is 60

Step-by-step explanation:

x= toms age

y= Marcy's age

x+y = 115

x-y = 5

We will want to use elimination since we have a +y and a -y in the system of equations.  Add the equations together

x+y = 115

x-y = 5

2x = 120

Divide by 2

2x/2 = 120/2

x = 60

Tom is 60

We need to find marcy's age

x+y = 115

60+y = 115

Subtract 60 from each side

60-60 +y = 115-60

y = 55

Marcy is 55

ce pula mea vrei ma

step-by-step explanation:

gayule

hello from mrbilldoesmath!

answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

p.s.   i'll be on vacation from friday, dec 22 to jan 2, 2019. have a great new year!