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Andrei [34K]
4 years ago
11

Solve the following: X=5y-3 X+y=9

Mathematics
2 answers:
Margaret [11]4 years ago
7 0
One way is to subsitute
since we know that x=5y-3, we can subsiutte that for x in the second equation

5y-3+y=9
6y-3=9
add 3
6y=12
divide 6
y=2
subsitute
x+y=9
x+2=9
subtract 2
x=7

x=7
y=2
MissTica4 years ago
4 0
x=5y-3\\x+y=9\\(5y-3)+y=9\\6y-3=9\\6y=12\\y=2\\\\x=5(2)-3\\x=10-3\\x=7

x = 7
y = 2
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If s(x)=2-x^2 and t(x)=3x, which value is equivalent to (s*t)(-7)?
andreyandreev [35.5K]

Answer:

(s*t)(-7) = 987

Step-by-step explanation:

s(x) = 2 - x²

t(x) = 3x

To find (s*t)(x), multiply s(x) and t(x).

(s*t)(x) = (2 - x²)(3x)

(s*t)(x) = 6x - 3x³

Now that you have (s*t)(x), plug -7 in.

(s*t)(-7) = 6(-7) - 3(-7)³

(s*t)(-7) = 6(-7) - 3(-343)

(s*t)(-7) = -42 + 1029

(s*t)(-7) = 987

5 0
4 years ago
Pls hurry I need an answer!!!
nlexa [21]

Answer:

133 degrees

Step-by-step explanation:

if FBE is 47 degrees and is identical to angle CBD, then we can consider

EBD as 180 degrees first and subtract 47 degrees, which is 133 degrees, that is how I got my answer.

hope it helped in any way.

3 0
3 years ago
I need help combining like terms 2-x^3-4+3y+y+y+5
OLEGan [10]

Answer:

-x³ + 5y + 3

Step-by-step explanation:

It helps to rewrite the given polynomial according to its degree (exponent), in <u>descending</u> order. Also, for variables without a coefficient, it helps to include "1" with it to make it less confusing when combining like terms.

- x³ + 3y + ( 1 )y + ( 1 )y + 5 + 2 - 4

One way to simplify a polynomial is to combine the like terms if there are any. Two or more terms in a polynomial are like terms if they have the same variable(s) with the same exponent.

- x³ is the only term with an exponent of 3, so we wouldn't have to combine it with other terms. We need to combine the terms with the variable "y," as they have the same degree of 1.

- x³ + 5y + 5 + 2 - 4

Lastly, combine the constants (5 + 2 - 4):

- x³ + 5y + 3

Please mark my answers as the Brainliest if you find my explanations helpful :)

3 0
3 years ago
Greg thinks of a number, multiplies it by 3, subtracts 5 and then multiplies by 2. His answer is 26. What number did Greg think
soldi70 [24.7K]

Answer:

x

3x

3x-5

2(3x-5)

so

2(3x-5)=26

3x-5=13

3x=18

x=6

he thought of 6

8 0
2 years ago
Write an equation in slope-intercept form of the line that passes through (-1, 4) and (0, 2)
MrMuchimi

Answer:

y = -2x + 2

General Formulas and Concepts

<u>Pre-Alg</u>

  • Order of Operations: BPEMDAS

<u>Algebra I</u>

Slope-Intercept Form: y = mx + b

  • m - slope
  • b - y-intercept

Slope Formula: m=\frac{y_2-y_1}{x_2-x_1}

Step-by-step explanation:

<u>Step 1: Define</u>

Point (-1, 4)

y-intercept (0, 2)

<u>Step 2: Find slope </u><em><u>m</u></em>

  1. Substitute:                    m=\frac{2-4}{0+1}
  2. Subtract/Add:               m=\frac{-2}{1}
  3. Divide:                          m=-2

<u>Step 3: Write linear equation</u>

y = -2x + 2

4 0
3 years ago
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