SaliJano8950
22.10.2020 •
Mathematics
Plz Help me, I will mark 1st brainlest
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Ответ:
1 Subtract 2424 from both sides.
y-24=-4xy−24=−4x
2 Divide both sides by -4−4.
-\frac{y-24}{4}=x−
4
y−24
=x
3 Switch sides.
x=-\frac{y-24}{4}x=−
4
y−24
Step-by-step explanation:
1 Subtract yy from both sides.
4x=24-y4x=24−y
2 Divide both sides by 44.
x=\frac{24-y}{4}x=
4
24−y
Ответ:
Correct cos(α - β) = 140/221
Step-by-step explanation:
cosα = ±√(1 - sin²α) => cosα = ±√(1 - (-5/13)²) = ±√(1 - (25/169)
cosα = ±√(169 -25)/169 = ± √144/169
cosα = ± 12/13 since it is given that α (alpha) ends in the third quadrant
we choose cosα = - 12/13
we know that is tanβ = sinβ/cosβ = - 8/15 or sinβ : cosβ = 8 : 15 =>
sinβ = 8k and cosβ = 15k where k is the coefficient of proportionality
we know the basic trigonometric equality
sin²β + cos²β = 1 when we replace the coefficients we get
(8k)² + (15k)² = 1 => 64k² + 225k² = 1 => 289k² = 1 => k² = 1/289 =>
k = 1/17 now we get sinβ and cosβ
since it is given that β (beta) ends in the second quadrant
sinβ = 8/17 and cosβ = - 15/17
As we know it is:
cos(α - β) = cosα cosβ + sinα sinβ = - 12/13 · (- 15/17) + (- 5/13) · 8/17 =>
cos(α - β) = 180/221 - 40/221 = 140/221
cos(α - β) = 140/221
God is with you!!!