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What value of (k) gives infinitely many solutions for (2x+ky=4) and (6x+9y=12)?

Answer and explanation

Correct answer: (3)

A pair of linear equations has infinitely many solutions when both equations represent exactly the same line. In standard form, this happens when the ratios of corresponding coefficients and constants are equal: 
m a_1/a_2=b_1/b_2=c_1/c_2
m. This means one equation is a constant multiple of the other, so every point on one line also lies on the other. The equations here are already arranged in comparable standard form.

For 
m 2x+ky=4
m and 
m 6x+9y=12
m, the ratio from the x-coefficients is 
m 2/6=1/3
m, and the constant ratio is 
m 4/12=1/3
m. Therefore the y-coefficient must satisfy 
m k/9=1/3
m. Multiplying by 9 gives 
m k=3
m. Indeed, multiplying the first equation by 3 produces the second, so option C is correct.

Related tags

Linear EquationsParameterInfinite Solutions

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