Question

m,

Answer 1

you used "substitution" BTW, y= -1/2
you substituted for y in the 2nd equation

you could use "elimination"
y = 1/2 x - 6 or
2y = x -12 (multiply both sides by 2)
or x -2y = 12 (added -2y to both sides and +12 to both sides)
so your first equation in standard form is
x-2y=12


1x - 2y =12 <-- multiply both sides by -2
2x + 6y = 19

after multiplying both sides (every term) by -2 you get

-2x + 4y = -24
2x + 6y = 19 now add the 2 equations together term by term

can you do that?

Answer 2

I just gave the highlights
can you do
y = 1/2 x - 6 becomes 2y= x-12

Answer 3

2y= x-12

add -2y +12 to both sides

2y-2y+12= x-12-2y+12

can you simplify

Answer 4

you get 12= x-2y which we can write as
x-2y=12 (switching does not change anything)

Answer 5

you mean -2 times both sides of x-2y=12 ?
-2(x-2y) = -2*12
now simplify

Answer 6

or should I say, "distribute" the -2 on the left and simplify on the right

Answer 7

? what did you do?

Answer 8

first, recheck your first equation
-2(x-2y) = -2*12
a minus times a minus give a plus

Answer 9

Last step is to replace y with -1/2 in either equation and find x