Combine node_exporter metrics

Hi, I feel really dumb not being able to work this out but can you combine 2 rate metrics (cpu user and system usage) in to a single query.
I want to combine these 2 from node_exporter;
rate(node_cpu_seconds_total{mode=“user”}[1m]) * 100
rate(node_cpu_seconds_total{mode=“system”}[1m]) * 100

What’s the best way of achieving this.