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3x + 2y = 8
5x + 2y = 12

1 Answer

12 votes

Answer:

Explanation:

We can solve this in either of two ways. I'll do both.

Mathematically

3x + 2y = 8

5x + 2y = 12

Rewrite either equation to isolate y. I'll use

3x + 2y = 8

2y = 8 - 3x

y = (8-3x)/2

Now use this value of y in the other equation:

5x + 2y = 12

5x + 2((8-3x)/2) = 12

5x + (8 - 3x) = 12

2x = 4

x = 2

Use x=2 to find y:

y = (8-3x)/2

y = (8-3*(2))/2

y = (8-6)/2

y = 1

The point is (2,1)

Graphically

Graph the two equations and find the point they intersect. See attachment.

We obtain the same answer: (2,1)

3x + 2y = 8 5x + 2y = 12-example-1
User Serguei Fedorov
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