Ask question

Ask question

All categories

2 years ago

12

If x+y = -10 and x-y = 2 what is the value of x

1 answer:

madam [21]2 years ago

5 0

Answer:

x= -4

Step-by-step explanation:

adding the two equations,

x+x+y-y=-10+2

2x= -8

x=-4

You might be interested in

Katie solved the equation by completing the square. X2+12x−7=0 which equation shows one of the steps katie could have taken to c

sdas [7]

solution:

$x^{2}+12x-7=0\\add 7 to both side of the equation\\x^{2}-12x=7\\to creat a trinomial square on the left side of the equation.\\find a value that is equal to the square of b and the cofficent of x.\\(\frac{b}{2})^2=(-6)^2\\add the term to each side of the equation\\x^2-12x+(-6)^2=7+(-6)\\x^2-12x+36=43\\(x-6)^2=43\\solve the equation for x.\\$ $take the square root of each side of the equation to the set up the solution x,\\(x-6)^2.\frac{1}{2}=\pm \sqrt{43}\\x-6=\pm \sqrt{43}\\x=6\pm \sqrt{43}$

4 0

3 years ago

Read 2 more answers

Please help asap!!!!!!!

koban [17]

Answer:

-2

Step-by-step explanation:

7 0

2 years ago

I need help with this ^^ <br> It’s about choosing a graph to fit a narrative

jenyasd209 [6]

1. The fourth graph: D
2. The first graph: A

3 0

3 years ago

Find an equation of the line passing through the given points. Use function notation to write the equation. (3,8) and (4,13

Olegator [25]

Answer:

$f(x)=5x-7$

Step-by-step explanation:

The given line passes through the points;

$(x_1,y_1)=(3,8)$

and

$(x_2,y_2)=(4,13)$

Let us find the slope using;

$m=\frac{y_2-y_1}{x_2-x_1}$

$m=\frac{13-8}{4-3}$

$m=\frac{5}{1}=5$

The equation is given by;

$y-y_1=m(x-x_1)$

We substitute the values into the formula to obtain;

$y-8=5(x-3)$

$y=5x-15+8$

$y=5x-7$

There the equation of the line is

$f(x)=5x-7$

7 0

3 years ago

What is the value of the logarithm? ln(121) Round the answer to the nearest ten thousandth. Enter your answer in the box.

vovikov84 [41]

The value of the logarithm of ln(121) is <span> 4.7958 </span>Rounding <span>the answer to the nearest ten thousandth</span>

6 0

3 years ago

Read 2 more answers