Two vectors lying in the xy plane are given by the equations
And
)The value of
Is
A)19
B)−11
C)−19
D)11
E)10

Question

Two vectors lying in the xy plane are given by the equations 
And 
)The value of 
Is
A)19 
B)−11 
C)−19 
D)11 
E)10

Quizplus · Accepted Answer

To find the value of we need to take the dot product of the given vectors:

(11ea7ff9_2b24_12d8_a768_1fc6dc017f0c_TB2295_11) · (11ea7ff9_2b24_39e9_a768_b91cd70d19c7_TB2295_11) =

(5, -7) · (2, -5) = 5 × 2 + (-7) × (-5) = 19

Therefore, the value of 11ea7ff9_2b24_60fa_a768_f31cda64936f_TB2295_11 is -19.

The correct choice is C.

Two Vectors Lying in the Xy Plane Are Given by the Equations