Question

x+5y=7 4x+20y =k are coincide each other then find the value of k​

Answer 1

$if \: lines \: are \: coincide \\ \\ \frac{a1}{a2} = \frac{b1}{b2} = \frac{c1}{c2} \\ \\ \frac{1}{4} = \frac{5}{20} = \frac{7}{k} \\ \\ \frac{1}{4} = \frac{7}{k} \\ \\ k = 28 \\ \\ \\ mark \: me \: as \: brainliest$