Answer:
Step-by-step explanation:
I'm not exatcly sure what is meant by magnitude but if it is the slope it is simply -7 if it is asking about the actual magnitude or length of the vector then we use pthagorean theorum which is:
[tex]c^{2} =a^{2} +b^{2}\\[/tex]
when adjusted to solve for the answer is
[tex]c = \sqrt{a^{2}+b^{2}\\}[/tex]
which is c = sqrt (1^2) + (-7)^2 = [tex]\sqrt{50}[/tex] would be the exact answer
