<prompt> Laini y frac12 x 4 imeainishwa na fomuanzapmatrix x y mwishopmatrix anzapmatrix -7 s mwishopmatrix t anzapmatrix l -5 mwishopmatrix. Ingiza jozi iliyoagizwa s,l.  <response>: Tukichukua t 0, tunapata beginpmatrix -7 s endpmatrix iko kwenye mstari. Kishas frac12 -7 4 frac12.Tukichukua t 1, tunapataanzapmatrix x y mwishopmatrix anzapmatrix -7 12 mwishopmatrix anzapmatrix l -5 mwishopmatrix anzapmatrix -7 l -92 mwishopmatrix.Kisha-frac92 frac12 -7 l 4.Kutatua kwa l, tunapata l -10.Kwa hivyo, r,k left frac12, -10 kulia. 