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Tyrant4life
21.10.2020 •
Mathematics
Find the x−and y−intercepts.
−5x − 4y = 20
The x−intercept is
.
The y−intercept is
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Ответ:
x-intercept(s): (−4,0)(-4,0)
y-intercept(s): (0,−5)
Step-by-step explanation:
To find the x-intercept, substitute in 0 for y and solve for xx. To find the y-intercept, substitute in 0 for x and solve for y.
Ответ:
c. 108.4
Step-by-step explanation:
cos theta = (u dot v)/ (||u|| ||v||)
where dot stands for dot product and || || is the magnitude
u = (1,5) v= (7,-4)
u dot v = (1*7 + 5*-4) = 7-20 = -13
||u|| = sqrt( 1^2 +5^2) = sqrt(1+25) = sqrt(26)
||v|| = sqrt(7^2 + (-4)^2) = sqrt(49+16) = sqrt(65)
cos theta = -13/ sqrt(26) sqrt(65)
cos theta = -13 /sqrt(1690)
theta = arccos (-13/sqrt(1690))
theta = 108.43