132k views
5 votes
Find the solution to the system of equations: x + 3y = 7

and 2x + 4y = 8
1. Isolate x in the first equation:
2. Substitute the value for x into the second equation:
3. Solve for y
x = 7 - 3y
2(7 – 3y) + 4y = 8
14 - 6y + 4y = 8
14 - 2y = 8
-2y = -6
y = 3
x + 3(3) = 7
4. Substitute y into either original equation:
5. Write the solution as an ordered pair:

User Serg M Ten
by
8.0k points

2 Answers

4 votes

Answer:

( -2 , 3 )

...................................................................................

User DDan
by
7.6k points
6 votes

Answer:

(-2,3)

Explanation:

Doing it the way you did and working out the problem you substituted 3 into, x+3(3)=7, 3(3) is 9 and then you subtract 9 from both sides.

7-9=-2

x=-2

Then all you have to do is put it into ordered pairs.

(x,y)

(-2,3)

User Muhammad Hamada
by
8.2k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories