(5-7i)(2+4i)
a. 10+34i
b. 10-22i
c. -18+6i
d. 38+6i

Remember FOIL? If not, it stands for first, outer, inner, last. This basically means you multiply the first number in each set, then the inner numbers, then the outer numbers, then the last numbers, stick 'em together, and you have your answer. I'll illustrate!

(5 - 7i)(2 + 4i)

The first numbers are 5 and 2, so we multiply those to get 10. 
The inner numbers are -7i and 2, so we multiply those to get -14i.
The outer numbers are 5 and 4i, so we multiply those to get 20i.
Finally, the last numbers are -7i and 4i, so we multiply those to get -28i².

Our equation now is 10 - 14i + 20i - 28i².

Now to simplify! By combining terms we get:

10 + 6i - 28i²

And because (√-1)², or i², is equal to -1, -28i² becomes a positive 28. Now we can add that in to get:

38i + 6, or letter D, as our final answer.

Hope this helped!

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!

Ithink the answer is c just trying to others