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3 years ago

What is the slope of this graph? 13 −3 3 −13

Mathematics

2 answers:

Lisa [10]3 years ago

8 0

The answer is for that problem is -3

rosijanka [135]3 years ago

5 0

(0,2) (1,-1)
2+1/0-1
3/-1
-3
The slope of the line is -3

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Step-by-step explanation: google help

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2 years ago

4x+8y=-4<br> -5x + 3y=-21<br> (3-2)

cricket20 [7]

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2 years ago

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3 years ago

Rotate the point A (-3,4) 270°about the origin. Plot A' on the grid.

koban [17]

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3 years ago

Marco is 8 years younger than his brother Paolo. If their product of their ages is 105, how old is Marco? plz help

Nina [5.8K]

Answer:

Marco's age is 7 years old

Step-by-step explanation:

Let

x ----> Marco's age

y ----> Paolo's age

we know that

$x=y-8$ ----> $y=x+8$ ----> equation A

$xy=105$ ----> equation B

substitute equation A in equation B

$x(x+8)=105$

$x^2+8x-105=0$

Solve the quadratic equation

The formula to solve a quadratic equation of the form

$ax^{2} +bx+c=0$

is equal to

$x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$x^2+8x-105=0$

$a=1\\b=8\\c=-105$

substitute in the formula

$x=\frac{-8(+/-)\sqrt{8^{2}-4(1)(-105)}} {2(1)}$

$x=\frac{-8(+/-)\sqrt{484}} {2}$

$x=\frac{-8(+/-)22} {2}$

$x=\frac{-8(+)22} {2}=7$

$x=\frac{-8(-)22} {2}=-15$

Remember that the solution cannot be a negative number

The solution is x=7

therefore

Marco's age is 7 years old

4 0

3 years ago