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3 years ago

Ig nobody uses comments anymore :/

Mathematics

1 answer:

marta [7]3 years ago

8 0

Answer:

Step-by-step explanation:

9+10 is 19.

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Three times a first number decreased by a second number

ki77a [65]

Answer:

The two numbers are 3 and 5

Step-by-step explanation:

$3X-Y=12\\X + 4Y=17\\$

Multiply top equation by 4 to cancel out the Ys

$12X - 4Y = 48\\X + 4Y = 17\\\\13X = 65\\X = 5\\$

Since X =5, we can plug it into either of the top two equations to find out the value of Y

$3(5) - Y = 12\\15 - Y = 12\\Y = 3$

To double check

$3(5) - 3 \\15 - 3\\12\\\\5 + 4(3) \\5 + 12\\17$

3 0

3 years ago

For which values of x is the expression undefined?<br> x2 – 49<br> x2 – 16

Lyrx [107]

You meant to say x^2 - 49 and the second binomial is x^2 - 16.

x^2 - 49 = (x - 7) (x + 7).

Set each factor to 0 and solve for x individually.

x - 7 = 0

x = 7

x + 7 = 0

x = -7

Do the same for x^2 - 16.

Here is the set up:

x^2 - 16 = (x - 4) (x + 4).

Take it from here.

4 0

3 years ago

Solve for k: 7 < −(−k − 3) + 2

Nata [24]

Step-by-step explanation:

Solve for k by simplifying both sides of the inequality, then isolating the variable.

Inequality Form:

K>2

Interval Notation:

(2,∞)

4 0

3 years ago

Please solve : -9b(b+2)=0

Illusion [34]

Answer:

Step-by-step explanation:

Step 1: Simplify both sides of the equation.

−9b2−18b=0

Step 2: Factor left side of equation.

(−9b)(b+2)=0

Step 3: Set factors equal to 0.

−9b=0 or b+2=0

b=0 or b=−2

4 0

4 years ago

Find the equation of the straight line which passes through each of the following pairs of points.

Tems11 [23]

Answer:

y = 3x + 1

Step-by-step explanation:

First, find slope:

$y2 - y1 / x2 - x1$

$10 - 4/ 3 - 1 = 6 / 2 = 3$

Then, put the equation into point-slope form using the point (1, 4):

$y - y1 = m(x - x1)$

where m is the slope

y - 4 = 3(x - 1)

If you want to put this into slope-intercept form, it would be

$y-4=3(x-1)\\y - 4 = 3x - 3\\y = 3x + 1$

4 0

3 years ago