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At which point do the lines (x+5y=13) and (2x+5y=16) meet?

Answer and explanation

Correct answer: ( (3,2) )

The intersection of two lines is the ordered pair that satisfies both line equations. Since the terms involving y are identical, subtracting one equation from the other removes 5y and makes the calculation simple. Starting with 2x+5y=16 and subtracting x+5y=13 gives x=3.

Now substitute x=3 into the first equation: 3+5y=13. Therefore 5y=10 and y=2. The lines meet at (3,2), so option A is correct. Checking the second equation gives 2(3)+5(2)=6+10=16, confirming the result. A point such as (2,3) may look similar because its coordinates are reversed, but it gives 2+15=17 in the first equation and therefore is not the intersection.

Related tags

Subtraction MethodIntersectionGraphical Solution

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