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Find the point where these two equations intersect.5x - 2y = 73x + 4y = 9

User Salix
by
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1 Answer

20 votes
20 votes

Answer:

The intersection point is (1.769, 0.923).

Explanation:

First, let's isolate "x" in the first equation:

5x - 2y = 7

5x = 7 + 2y

x = (7 + 2y)/5

Now, we can use the expression we found in the second equation:

3x + 4y = 9

3(7 + 2y)/5 + 4y = 9

And find the value of y:

21/5 + 6/5y + 4y = 9

6/5y + 4y = 9 - 21/5

(6y + 20y)/5 = (45-21)/5

6y + 20y = 24

26y = 24

y = 24/26

y = 12/13 or 0.923

Since you found the value of y, we can substitute it in one equation and find the value of x:

x = (7 + 2y)/5

x = (7 + 2*12/13)/5

x = (7 + 24/13)/5

x = ((91+24)/13)/5

x = (115/13)/5

x = 23/13 or 1.769

The intersection point is (1.769, 0.923).

User Kirill Ignatyev
by
2.9k points