Question

Currently, Sam's coach is twice as old as Sam. When Sam started soccer 10 years ago, his coach was four times his age. How old is Sam now?

Answer 1

You need to write two equation, can you think of what these equations could be?

Answer 2

nope im dumb with math

Answer 3

Let C=coach's age
Let S=Sam's age
write an expression using C and S for the first statement. Coach's age is twice as big as Sam's age.

Answer 4

try!

Answer 5

c(2)+s= ???? @juantweaver

Answer 6

almost
2*age of Sam=age of Coach
so
2S=C

Answer 7

o alright

Answer 8

Now for the second equation.
Ten years ago Sam was what age?

Answer 9

we are looking for a formula for this as well

Answer 10

four times his age @juantweaver

Answer 11

first we have to figure out Sam's age ten years ago
This is
S-10

Answer 12

Then four times Sam's age ten years ago
4*(S-10)=(C-10)

Answer 13

So the two equations are
4*(S-10)=C-10
C=2*S

Answer 14

so what would i do next @juantweaver

Answer 15

substitute second equation into the first. (Replace all C's in first equation with what C is equal to in the 2nd equation

Answer 16

so its 4*(s-10)=2*s ? @juantweaver

Answer 17

close
4*(S-10) = 2*S - 10

Answer 18

alright can i solve it now ? or is there 1 more step ? @juantweaver

Answer 19

just solve for S

Answer 20

so its 4s-40=2*s-10

Answer 21

yes, keep going

Answer 22

4s-40=2s-20?

Answer 23

@juantweaver

Answer 24

no, return to
4s-40=2s-20

do you know how to combine like terms

Answer 25

8s=800 ? id that right

Answer 26

not quite
almost though, instead of multiplying the numbers over, you should be adding them or subtracting them
4s-2s = -20+40

Answer 27

o ok , then its 2s=60 right ?