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Leno4ka [110]
3 years ago
8

What is the right way to use substitution method?​

Mathematics
1 answer:
Kazeer [188]3 years ago
7 0

Answer:

Step-by-step explanation:

Substitution method can be applied in four steps. Step 1: Solve one of the equations for either x = or y = . Step 2: Substitute the solution from step 1 into the other equation. Step 3: Solve this new equation Happy too help!

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Consider ∠A such that cos A = 12/13.
Georgia [21]

A)

Using the unit circle, for the cos function to be positive, angle A must lie in either <u>quadrant I or quadrant IV</u>

B)

Using the unit circle, If the sine is negative, angle A must lie in either quadrant III or quadrant IV. Since we know that the cosine is positive, this only leaves <u>quadrant IV</u>

<u />

D)

cos = adj/hyp

Using Pythagorean theorem,

12^{2} +b^{2} = 13^{2}

b = ±5 (we know its -5 since we know sinA is negative)

this means that the x coord is 12, and the y coord is -5

any proportion of these two numbers would work as an answer

e.g. <u>(12, -5), (24,-10),  (12/13, -5/13),</u> are all valid answers

E)

sinA = opp/hyp

<u>sinA = -5/13</u>

tanA = opp/adj

<u>tanA = -5/12</u>

5 0
2 years ago
PLEASE HELP!!!! i will give branliest
borishaifa [10]

Answer:The last answer doesn't have a solution of -2

Step-by-step explanation:

7 0
3 years ago
Erin was completing the square of the quadratic function in order to find the extreme value. What is the next step in the proces
Lady bird [3.3K]

Step-by-step explanation:

ax^2+bx+c=0

a=leading term

ok so if the leading term is positive then opens up and has a <u>min</u>

if leading term is negative then opens down and has a <u>max</u>

leading term is positive

1x^2+8x

it has a min

to complete the square, move c aside take 1/2 of b and square it

b=8

8/2=4

4^2=16

now add that to both sides

x^2+8x+16+6=0+16

factor perfect square

(x+4)^2+6=16

subtract 6

(x+4)^2=10

subtract 10

(x+4)^2-10=0

vertex aka min or max is (h,k) when ou have

y=a(x-h)+k

h=-4

k=-10

7 0
3 years ago
Using the expression 5x2 + 7, match the following items. 1. 2 variable 2. 5 coefficient 3. 7 exponent 4. x constant
postnew [5]
5x^2 + 7

the coefficient is 5
the variable is x
the exponent is 2
the constant is 7
6 0
3 years ago
Read 2 more answers
True or false
valina [46]
False because a number is rational if we can write it as a fraction where the top number of and bottom number are both whole numbers but irrational numbers is any number that is not rational. It is a number that cannot be written as a ratio of two integers(or cannot be expressed as a fraction)
3 0
3 years ago
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