Question

Construct triangle XYZ such that angle x=60° angle z=45° and xz=8cm measure xy

Answer 1

I assume you can construct the two angles
(google them if not)
then draw XZ of length 8,
construct angles X and Z
where their rays intersect is Y

Answer 2

Draw it
angle y = 180 - 45 -60 = 75
law of sines
(sin 75 ) / 8 = (sin 45) / xy