Question

Marks,jasper and Eric are brothers. Mark is 2 years less than twice the age of Eric. Jasper is four years younger than eric. the sum of their ages is 22. write an equation in one variable that can be used to find eric's age. Determine the ages of mark and jasper. @perl

Answer 1

M = 2*E - 2

J= E - 4

M + J + E = 22

Answer 2

What do i do first @perl ?

Answer 3

from the second equation you can substitute E in terms of J

Answer 4

ola, you can also plug it into wolfram like this
wolframalpha.com

"solve M = 2*E - 2, J= E - 4, M + J + E = 22"

Answer 5

yeah @perl

Answer 6

@Miracrown can you look this over

Answer 7

Mark,Jasper and Eric are Brothers. Mark is two years less than twice the age of eric. Jasper is 4 years younger than eric. the sum of their ages is 22.

Answer 8

ill try to find someone to check this over. its possible i made a mistake somewhere

Answer 9

@gorv can you check this . did i read this wrong

Answer 10

pug in the values in
M+J+E=22

Answer 11

2E-2+E-4+E=22
4E-6=22

Answer 12

M = 12,E = 7, J = 3

Answer 13

ok for some reason wolfram said there is no solution

Answer 14

yeah bro :)

Answer 15

u can match the value

Answer 16

http://www.wolframalpha.com/input/?i=solve+m+%3D+2*e+-+2%2C+j%3D+e+-+4%2C+m+%2B+j%2Be+%3D+22

Answer 17

M=2*7-2=12

Answer 18

Thank you guys i was really stuck !! @perl @gorv

Answer 19

no lol just remove the solve from there

Answer 20

@perl u r smart mathematician ..nobody can let u down :)

Answer 21

yeah, but do you know the command to solve a system of equations for wolfram?

Answer 22

http://www.wolframalpha.com/input/?i=+m+%3D+2*e+-+2%2C+j%3D+e+-+4%2C+m+%2B+j%2Be+%3D+22

Answer 23

theres no solution there, the lines do not intersect

Answer 24

no lol i used by hand alwys ..it was just trial and error....i tried removing solve

Answer 25

oh, for some reason wolfram wants to force these into lines. they are intersections of 3 planes

Answer 26

not three lines

Answer 27

i agree ..i also think so ..well prob is done :)

Answer 28

thankyou gorv for your comments and insight

Answer 29

that was clever to remove 'solve', now i see that wolfram thought it was three lines

Answer 30

i have an idea, lets use x,y,z

Answer 31

lol no need to thank....we are helpin others here ...doin good ....u would have done the same if i have asked lol

Answer 32

that will be better

Answer 33

it worked now

Answer 34

http://www.wolframalpha.com/input/?i=+solve+x+%3D+2y+-+2%2C+z+%3D+y+-+4+%2C+x+%2B+y+%2B+z+%3D+22

Answer 35

computers are finicky :)

Answer 36

hahhaha :D