Dina found two angles of a parallelogram to be equal to 40 degree and 50 degree. what should we conclude about dina's calculations and why?

The calculations are incorrect because the angles in a parallelogram are either:
The same
or complimentary (add up to 180)

Neither case is true here so the calculations are incorrect.

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Abit confused about what you mean, but i think you might be referring to slope intercept form: y = mx + bin that case b, or the y intercept is already given.(0,-1)find the slope by using the formulay2 - y1/x2 - x1the final slope will be 4/2, equivalent to 2.now your equation should look like thisy = 4/2x -1sorry if this didn’t you out!