You determine your available spell slots by adding together all your levels in the bard, cleric, druid, sorcerer, and wizard classes, half your levels (rounde…

Phb page 101, sorcerer, spellcasting, spell slots: If you multiclass a warlock and a sorcerer, then you have a character with both the spellcasting and pact m…

Add half your levels (rounded up) in the artificer class to the appropriate levels from other classes to determine your available spell slots. A multiclass ch…