Question

Use the solution of the system below to find x - y. (So, solve the system, then subtract your values you got.)

4x - 2y = 11
3x - 4y = -6

Answer 1

do you wan to solve it by elimination or by substitution - what method ?

Answer 2

Um substitution i guess

Answer 3

ok

how many will be y from the first equation ?

Answer 4

in case of the first equation what will get for y= ?

Answer 5

y=2x-11/2..?

Answer 6

right

so than by substitution method you need substituting this value of y in place of y inside second equation - yes ?

Answer 7

and so will get the value of x

Answer 8

x=2(2y-3)/3

Answer 9

no

you need getting value without y

Answer 10

4x - 2y = 11 => y=(4x-11)/2 - yes ?
3x - 4y = -6

Answer 11

so this value of y you need substituting in place of y inside second equation - what will get ?

Answer 12

3x -4(4x-11)/2 = -6 do you can continue it ?

Answer 13

x=28/5

Answer 14

the 4 from the front of parentheses and the denominator simplifie it by 2 and will get

Answer 15

so ok. than this is right value of x so just substitute it in place of x and calcule the value of y - ok ?

Answer 16

x=28/5

y=(4x-11)/2

so y = (4*28/5 -11)/2

y= ?

Answer 17

57/10?

Answer 18

so than this is right so your exercise aboce said that at the end when you have got the value of x and y you need to find x-y= ?

Answer 19

-0.1

Answer 20

x-y= ?

x= 28/5

y= 57/10

x-y= 28/5 - 57/10 = ?

yes -0,1

Answer 21

wsa my pleasure

bye bye