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0 votes
5

x

5
y
=

15
3
x

2
y
=

7

User Pranvera
by
8.0k points

2 Answers

4 votes

Answer:

( - 1 , 2 )

Explanation:

5x - 5y = - 15

3x - 2y = - 7


\left \{ {{5x-5y=-15} \atop {3x-2y=-7}} \right.
\left \{ {{x-y=-3} \atop {3x-2y=-7}} \right.
\left \{ {{-3x+3y=9} \atop {3x-2y=-7}} \right.

(1) + (2)

y = 2 -------> (1)

x = - 1

( - 1 , 2 )

User Interlude
by
9.0k points
3 votes


{\huge{\boxed{\mathbb{QUESTION}}


\begin{bmatrix}5x-5y=-15\\ 3x-2y=-7\end{bmatrix}


substitute\:x\:for\:-3+y


\begin{bmatrix}3\left(-3+y\right)-2y=-7\end{bmatrix}


{\huge{\boxed{\mathbb{SIMPLIFY}}


\begin{bmatrix}-9+y=-7\end{bmatrix}

add 9 to both sides


y=2

Remember
x=-3+y

instead of
y we will put
2


x=-3+2\\x=-1


{\huge{\boxed{\mathbb{ANSWER}}


  • y=2

  • x=-1
User Oliver Apel
by
7.5k points

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