Question

Help with Solving by substitution ;; Please and thanks

Answer 1

Problem i need help with ;;

Answer 2

I'd prefer to learn how to do this aswell if anyone has the time to help.. we've had a sub the past couple days and they aren't very good at teaching the material... im struggling pretty bad ^^;

Answer 3

multiply second eq with 2

Answer 4

then subtract the two equations y terms will get cancelled

Answer 5

it wants it done with the method of substitution. Re-arrange the second equation to get y on its own, and then sub this back into the first equation

Answer 6

Uh... im so lost... x.x

Answer 7

Hes saying multiply.. and you're saying to re-arrange.. so im kinda confused here x.x

Answer 8

so if you re-arrange the second equation to get y on its own:

Y=3.25x+0.75

Answer 9

oh i see

Answer 10

well the multiply would work, but the question wants you to use substitution

Answer 11

so once you re-arrange why, just sub that back into the first equation and this will allow you to find x

Answer 12

y* not why lmao

Answer 13

Lol i was about to say... so y= -2?

Answer 14

i get Y to be 4

Answer 15

whats your working out?

Answer 16

huh.... i just assumed cause Y was -2 on the other

Answer 17

oh i see how you got 4, when you add the 3.25 with 0.75 you get 4x. What happens to the x?

Answer 18

kk this is my working out:

Answer 19

so re-arrange the second equation to get y on its own : y=3.25x +0.75

then sub this back into the first equation : -4.5x-2(3.25x+0.75)=-12.5
so, -4.5x -6.5x-1.5=-12.5
-11x=-11
so x=1, then sub this back into either equation to get y=4

Answer 20

oh i see .. thats not as confusing as ive been thinking

Answer 21

okay..calculate the value of x or y in from one equation....and put that value in ither equation

Answer 22

I think i've got it now, Thank you jbn