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Elza [17]
3 years ago
9

The y-intercept of the line whose equation is x - y = 7 is

Mathematics
2 answers:
Alina [70]3 years ago
7 0
X- y = 7
⇒ y -x = -7 (multiply by -1 on both sides).
⇒ y +(x-x)= -7 +x
⇒ y= x-7

The y-intercept of the line is y= x-7.

Hope this helps~
Delvig [45]3 years ago
3 0
X-y=7
 so you have to rewrite the equation in the form of mx+b=y
so ... x-y=7 
         -x     -x
     -y=7-x then simplify
-y(-y)=-(7-x) multiply both sides by -1
y=-7+x
  which is the same y= x-7
                                y=x+-7
  
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The function u(x)=-x+3x^{2} -8 is a quadratic function due to the highest exponent being 2.

Given functions are:

u(x)=-x+3x^{2} -8

v(x)=2x^{2} +8x^3+9x

y(x)=x^{2} +3x^5+4

z(x) =7x^{2} +2x^3-3

<h3>What is a quadratic function?</h3>

A function of the form f(x)=ax^{2} +bx+c with a\neq 0 is called a quadratic function means the highest exponent of polynomial should be 2.

Let us check one by one.

u(x)=-x+3x^{2} -8

Highest exponent =2

The function is also of form f(x)=ax^{2} +bx+c so u(x) is a quadratic function.

The functions v(x), y(x), and z(x) are having highest exponents as 3,5, and 3 respectively so they are not quadratic functions.

Hence, the function u(x)=-x+3x^{2} -8 is a quadratic function due to the highest exponent being 2.

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brainly.com/question/1214333

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Joan and her brother Justin left a hotel at the same time, driving in opposite directions at constant rates. After traveling for
inessss [21]

Answer:

Joan drive with a speed of 55 miles per hour.

Step-by-step explanation:

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To find:- Speed of Joan = ?

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Let speed of Joan be x,

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