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16 votes
16 votes
Solve by substitution.
x + 3y = -2
1-3x + y = 6

User Overallduka
by
3.0k points

1 Answer

7 votes
7 votes
Step-by-step explanation:
3
x
+
y
=
2

x

3
y
=
6


6

3
y
=
x
Substitute this equation into the other system wherever you see
x
.
3
(

6

3
y
)
+
y
=
6
Distribute
3
onto
(

6

3
y
)

18

9
y
+
y
=
2
Combine alike terms

8
y
=
20
Divide to solve for
y

8
y

8
=
20

8

y
=

20
8
Then solve for
x
using the value of
y
.

x

60
8
=
6
x
=

108
8
y
=

20
8
User Rowana
by
3.3k points