hi, i was having some difficulty with the following questions..

for the first one, don't infinite solutions only apply to homogeneous systems with more unknowns than linear functions (when reduced). the first question is asking for 3 equations with 3 unknowns giving infinite solutions.. so i don't get how that works out.

the second question i'm having trouble with because do i solve it reducing first, and solving the unknowns or .. ?? thanks!!

also: this one too