how do you solve this?

Question

y=x-9
x+8y=0

Answer 1

y=x-9
x+8y=0
thus through substitution
x + 8(x-9) = 0
x + 8x - 72 = 0
9x = 72
x = 8

Answer 2

Using the first equation: y=x-9 solve for x in terms of y. so add 9 to both sides and you get x=y+9

Next substitute what x equals into the second equation so you have (y+9) + 8y = 0
Now solve for y: 9+9y =0
take the 9 out 9(1+y) =0
divide the on both sides 1+y=0
subtract 1 on both sides y= -1

now put your y value in the first equation so you have
-1 = x-9
add 9 to both sides 8 = x


So, x=8 and y= -1

Answer 3

y = x - 9 ; x = y + 9 ; x + 8y = 0
sustituting y + 9 + 8y = 0
y = -1
therefore @x = -8y ; x = -8(-1) = 8
x = 8

Answer 4

First you decide which variable to solve for. Since y equals x-9, you can substitute (x-9) in for y in the second equation.

so you get x+8(x-9)=0

after distributing the 8, you get x+8x-72=0

then you combine like terms and solve for x...
9x-72=0
9x=72
x=8

Then simply plug in 8 for x to find what y equals.

y=(8)-9
y=-1

Answer 5

y=x-9...........a
x+8y =0..........b
change equation a to get the x on the other side
-x+y=-9
now add this on x+8y = 0
x+8y = 0
-x+y=-9
9y=-9
y=-1
substitute this in equation a
-1=x-9
x=9-1
x=8
so x=8 and y=-1

Answer 6

y = x - 9 -----(1)
x + 8y = 0 -------(2)

Sub (1) into (2),
x + 8(x-9) = 0
x + 8x - 72 = 0
9x = 72
x = 72/9
x = 8

When x=8, y = 8 - 9 = -1

So x=8 and y=-1.

Answer 7

x + 8x - 72 = 0
9x = 72
x = 8
y = - 1

Answer 8

take the second equatiion and write/work it out in terms of x
then input into the first equation in place of where the x is, then write this equation interms of y.
thus you have a numerical answer for y

put the final result as x=.... and y=.....

you can double check it by inputting the data into one or any of the eqations you stated above and it should work out

Answer 9

The goal is to get one equation with one variable, then you can solve it.


Solve the second equation for one of the variables. It's easiest to solve for x:

x=-8y.

They plug it in to the first equation:

y=(-8y)-9
9y=-9
y=-1

Answer 10

y=x-9 ---------------(1)

x+8y=0 ----------------(2)

substituted (1)into(2)

x+8(x-9)=0
x+8x-72=0
9x=72
x=8

x=8
from(1)
y=x-9
y=8-9
y=-1

thus,x=8,y=-1