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If A = (xa, ya) and B = (xb, yb) and xa is not equal to xb, then gradient of AB = (ya - yb)/(xb - xb).If xa = xb then the gradient is undefined.
2a. (a, b and c are all equal.)
If a equals 3 and b equals minus 5 then a minus b equals what
6 === the what does B =