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PLEASE HELP ME ASAP!

PLEASE HELP ME ASAP!-example-1
User Ariestav
by
7.3k points

2 Answers

1 vote

(For this, I'll be using the substitution method.)


So firstly, subtract 9 on each side of the first equation. Your equation will look like this:
2y-9=-x


Next, flip the signs around in the first equation. Your equation will look like this:
-2y+9=x


Next, substitute x in the second equation for (-2y+9). From there you can solve for y.
3(-2y+9)-6y=15


Firstly, foil 3(-2y+9).
-6y+27-6y=15


Next, combine like terms:
-12y+27=15


Subtract 27 on each side:
-12y=-12


Lastly, divide -12 on each side, and your answer should be
y=1



To solve for x, just substitute y for 1 in either equation. For this Ill be doing the first equation.



2(1)=-x+9


Multiply 2 and 1
2=-x+9


Subtract 9 on each side
-7=-x


Lastly, flip the signs, and your answer should be
7=x



In short, the answer is (7,1).

User Rajasekaran M
by
6.9k points
4 votes

Ok so first we find the equation that equals one variable.


2y = -x + 9

3x - 6y = -15


We solve for y.


2y = -x + 9

y = -x/2 + 9/2


Then we plug in this y value into the other equation to keep only one variable so we can solve for it.


3x - 6y = -15

3(-x + 9/2) - 6y = -15

-3x + 27/2 - 6y = -15

-9y + 27/2 = -15

-9y = 3/2

-y = 3/18

y = -3/18


Then we plug in this numerical y-value into the first equation which we found out by solving an equation for y.


y = -x/2 + 9/2

-3/18 = -x/2 + 9/2

-84/18 = -x/2

-x = 9 1/3

x = -28/3


Your answer would be (-28/3, -3/18)


Hope this helps!

User Shel
by
6.9k points