191k views
6 votes
Solve by substitution: 5x+y=-13 and y=7

User Andrewkslv
by
6.3k points

2 Answers

7 votes

Answer: 4/7

Step-by-step explanation: Multiply each equation by the value that makes the coefficients of

y

opposite.

5

x

+

2

y

=

7

(

2

)

(

3

x

y

)

=

(

2

)

(

13

)

Simplify.

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5

x

+

2

y

=

7

6

x

2

y

=

26

Add the two equations together to eliminate

y

from the system.

5

x

+

2

y

=

7

+

6

x

2

y

=

2

6

1

1

x

=

3

3

Divide each term by

11

and simplify.

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x

=

3

Substitute the value found for

x

into one of the original equations, then solve for

y

.

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y

=

4

The solution to the independent system of equations can be represented as a point.

(

3

,

4

)

The result can be shown in multiple forms.

Point Form:

(

3

,

4

)

Equation Form:

x

=

3

,

y

=

4

User Birla
by
7.3k points
7 votes
The answer I got is X=6/5 y=7
User Marthe
by
6.9k points