(a) t-7<-15 We assume that this is to be graphed as a single variable (on a number line as opposed to a coordinate plane.)

Add 7 to both sides to get t<-8. The graph:

(b) b+12<18

Subtract 12 from both sides to get b<6.

In both cases the graphs are...

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(a) t-7<-15 We assume that this is to be graphed as a single variable (on a number line as opposed to a coordinate plane.)

Add 7 to both sides to get t<-8. The graph:

(b) b+12<18

Subtract 12 from both sides to get b<6.

In both cases the graphs are rays beginning with an open dot; the endpoint is not a solution to the inequality.