MATHEMATICS HIGH SCHOOL

Y=3x 2x+y=15
Can you please help with this? It's confusing. It's soling systems of equations by substitution

Answers

Answer 1
Answer: so you subtitute y=3x into
2x+y=15
so
2x+(3x)=15
add like terms
5x=15
divide both sides by 5
x=3

subtitute x=3 into first equation (y=3x)
y=3(3)
y=9
Answer 2
Answer: it's simple jus plug in 3x into Y and u will have 2x+3x=15 
                                                                              5x=15
                                                                               the answer(x=3)

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If f(x) = 3x + 2 and g(x) = x2 + 1, which expression is equivalent to (fxg) (x)?

9. When graphing, what does the y intercept describe? *The place where the line or curve crosses, or touches, the x axis

The place where a line or gurve crosses, or touches, the y axis

O I don't know.

Answers

Answer:

Every straight line can be represented by an equation: y = mx + b. ... The y-intercept of this line is the value of y at the point where the line crosses the y axis.

X^4 - 4x^4 - 6y^3 - 2x^4

Help !!

Answers

6x^-12 - 6y^3 ... I think

Answer:

If you're simplifying it then it should be -5*x^4-6*y^3.



Which number is equivalent to 3⁴ ÷ 3²

Answers

Answer: 3²

Step-by-step explanation: In this problem, notice that our 3's are bases. So as we apply the quotient rule to divide these two powers, we subtract the exponents but leave the base alone.

So  3⁴ / 3² = 3².

What is the value of z in the equation 2(4z − 9 − 7) = 166 − 46?19
21
26
34

Answers

The value of z in the following equation 2(4z − 9 − 7) = 166 − 46 is 19. Details about solving equations can be found below.

How to solve algebraic expressions?

An algebraic equation is a mathematical equation in which one or both sides is an algebraic expression, such as 2x + 7y = 3.

The following algebraic equation is given in this question; 2(4z − 9 − 7) = 166 − 46. The value of z can be calculated as follows:

8z -18 - 14 = 120

8z - 32 = 120

8z = 152

z = 152/8

z = 19

Therefore, the value of z in the following equation 2(4z − 9 − 7) = 166 − 46 is 19.

Learn more about algebraic equation at: brainly.com/question/953809

#SPJ2
2(4z-9-7)=166-46 well, perentices (however u spell these things) first, -9-7 = -16 so 2(4z-16)=166-46 and distributive property so 8z-32=166-46, 166-46 = 120, so 8z-32=120, add 32 to both sides, which would be 8z=152 divide both by 8, z=19 

Maria gathered the data in the table. She finds the line of best fit to be y = 2.78x – 4.4.What is the residual value when x = 4?

–6.72
–0.58
0.58
6.72

Answers

The data in the table is not shown here but here is the formula for the residual
residual = observed value - predicted value

To get the predicted value, you simply use the best fit equation:
y = 2.78x - 4.4

Substituting 4:
y = 2.78(4) - 4.4
y = 6.72

This value is subtracted from the observed value to get the residual.
The correct answer would be C.0.58

You plug 4 into the line of best fit and get 6.72. This is your predicted value, but the residual is the difference between the actual value and predicted. So you subtract: 7.3-6.72=0.58.

David typed 210 words in 30 minutes. What is her rate of typing?

Answers

210 words ... 30 minutes
x words ... 1 minute

If you would like to know how many words can David type in 1 minute, you can calculate this using the following steps:

x * 30 = 210 * 1      /30
x = 210 / 30
x = 7 words

Result: David can type 7 words in 1 minute.
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