Answer: x=3 and y=−2
Step-by-step explanation:
x=−2y−1;4x−4y=20
Step: Solve x=−2y−1 for x:
Step: Substitute−2y−1 for x in 4x−4y=20:
4x−4y=20
4(−2y−1)−4y=20
−12y−4=20(Simplify both sides of the equation)
−12y−4+4=20+4(Add 4 to both sides)
−12y=24
−12y
−12
=
24
−12
(Divide both sides by -12)
y=−2
Step: Substitute−2 for y x=−2y−1:
x=−2y−1
x=(−2)(−2)−1
x=3(Simplify both sides of the equation)
Answer:
-24
Step-by-step explanation:
20-(-20)+16
More steps
20 - 5*-4 + 2*8
There are 2 ways to do this:
1) Transform tan into terms of sin.
where
Substituting back in gives:
2) Use a right triangle.
sin = opp/hyp --> opp = 2, hyp = 5
Use Pythagorean theorem to solve for adjacent side.
tan = opp/adj
Answer:
7 5/7 inches long
Step-by-step explanation:
To find the length of his hair now you need to find 3/4 of 10 2/7.
3/4* 72/7
216/26
54/7
7 5/7 inches long
Answer:
7d
Step-by-step explanation:
10d-3d
Factor out a d
d(10-3)
d (7)
7d