Question

Help

Answer 1

dont know how to use a graphing calc

Answer 2

one way to look at this is letting x = rate of first mechanic and y = rate of second mechanic.

rate = price/hour --> price = hour * rate

15x + 5y = 1200

x + y = 130

Answer 3

so now what?

Answer 4

You want to solve using the elimination method

15x + 5y = 1200
x + y = 130

You want to multiply the bottom equation by either negative five to cancel y or negative 15 to cancel x.

Answer 5

so 1200=15+5*y?

Answer 6

you use substitution; easier to start with the second line and re-arranging it to : y = 130 - x.

this is plugged in the first: 15x + 5(130 - x) = 1200

Answer 7

oh okay

Answer 8

so 10x+650=1200?

Answer 9

yes

Answer 10

and then its 55?

Answer 11

yes

Answer 12

but thats whose rate?

Answer 13

the first guy, who worked 15 hours

Answer 14

okay so how do i get the second? by plugging in the 15 in the y?

Answer 15

by using x + y = 130

Answer 16

oh okay

Answer 17

so 55+5=130?

Answer 18

wait that is not right lol

Answer 19

so x=55 right?

Answer 20

yes x = 55

Answer 21

okay so 55+y=130 right?

Answer 22

y=75?

Answer 23

so X=55
Y=75

Answer 24

yes

Answer 25

thanks