bool09

hello everyone. i've been trying to simplify this function (y' + x).(y + z). i've done a little simplification but i'm finding it hard to finish.. Here's what i've done = yy' + y'z + xy + xz (yy' = 0) = y'z + xy + xz the final answer is y'z + xy.. (i don't how to get here, i have no idea), and i also don't want to use K-maps.. Any help is appreciated very much.. Thanks..