138k views
5 votes
Y + x = 4 and y = 2x - 8 Solve the system of equations.

User Hjm
by
7.9k points

2 Answers

6 votes

Answer:

x = 4, y = 0.

As an ordered pair it is (4, 0).

Explanation:

Rewriting the second equation as the same format as the first:

y + x = 4

y - 2x = - 8 Subtract (1) - (2):

0 + 3x = 12

x = 4.

Plug x = 4 into the first equation:

y + 4 = 4

y = 0.

Check in the second equation:

y = 0 = 2(4) - 8 = 8 -8 = 0. OK.

User Aawaz Gyawali
by
8.7k points
4 votes
is this substitution? if it is the answer is (4,0)
User Jim Chertkov
by
8.0k points

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