Both would work. It's not hard to see (something or other) if you draw a line here (now or in the future). OR if you drew a line here (now or in the future hypothetically, or in the past).
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ILEIf we drew a line here, we could see that we go up three units and right 1 unit. Hence, I'd say the slope of the tangent line is approximately 3.Grammatically correct. Although 'drew' is formally the past tense, it is conceptually an indicator of an imagined (hypothetical) operation regarding your graph. So in this context it completely loses its meaning