List of top Mathematics for Economy Questions on Linear regression asked in IIT JAM EN

The linear system of equations
𝑥 + 𝑦 = 3,
$𝑥 + (𝑘^2 − 8)𝑦 = 𝑘, 𝑘 ∈ 𝑅$
has no solution for 𝑘 = _____ (in integer).