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43 votes
43 votes
3x + 3y = 18
5x + 3y = 28

User Riteshmeher
by
3.3k points

2 Answers

30 votes
30 votes


x=6-y


x=(28-3y)/(5)

User Rfeak
by
2.8k points
13 votes
13 votes

Answer:

(5, 1 )

Explanation:

3x + 3y = 18 → (1)

5x + 3y = 28 → (2)

subtract (1) from (2) term by term to eliminate y

(5x - 3x) + (3y - 3y) = 28 - 18

2x + 0 = 10

2x = 10 ( divide both sides by 2 )

x = 5

substitute x = 5 into either of the 2 equations and solve for y

substituting into (1)

3(5) + 3y = 18

15 + 3y = 18 ( subtract 15 from both sides )

3y = 3 ( divide both sides by 3 )

y = 1

solution is (5, 1 )

User Klas Mellbourn
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3.6k points