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1 year ago

13

What is the slope of the line that passes through the points (-4,210) and (-7, -19)?

1 answer:

Ghella [55]1 year ago

6 0

It’s the 7 and the other

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Solve the following system of equations for a and for b:

viktelen [127]

Answer:

$a=3\\b=1$

Step-by-step explanation:

$9a+3b=30\\8a+4b=28$

Let's solve the second equation for a to later on replace it in the first equation.

$8a+4b=28\\8a=28-4b\\a=\frac{28-4b}{8}$

Now plug this into the first equation.

$9a+3b=30\\9(\frac{28-4b}{8})+3b=30$

Distribute the 9

$(\frac{252-36b}{8}) +3b=30$

Break down the fraction.

$\frac{252}{8}-\frac{36b}{8}+3b=30$

Simplify.

$\frac{63}{2}-\frac{9}{2}b+3b=30$

Subtract $\frac{63}{2}$

$-\frac{9}{2}b+3b=30-\frac{63}{2}$

Combine like terms.

$\frac{-9+2*3}{2}b=\frac{30*2-63}{2}$

$\frac{-9+6}{2}b=\frac{60-63}{2}$

$\frac{-3}{2}b=\frac{-3}{2}$

Muliply by the reciprocal or inverted fraction next to b.

$(-\frac{2}{3})(-\frac{3}{2}) b=-\frac{3}{2}(-\frac{2}{3})$

$b=1$

Now plug this value into any of the equations to find the value of a.

$8a+4b=28\\8a+4(1)=28\\8a+4=28\\8a=28-4\\8a=24\\a=\frac{24}{8}\\ a=3$

5 0

3 years ago

2. What is the value of x if the angles<br> within a triangle are 2x +1, 7x-2 and 3x<br> +5?

noname [10]

Answer:

$x=14.67\\$ °

Step-by-step explanation:

The sum of all the three angles of any triangle is 180°

Putting sum of all the angles given equals to 180°

$(2x+1)+(7x-2)+(3x+5)=$ $180$ °

$2x+7x+3x+1-2+5=180$ °

$12x+4=180$ °

$x=\frac{180-4}{12}$

$x=14.67\\$ °

The value of the x is found on solving the given angles of the triangles.

8 0

2 years ago

What is 4x • 6y =9c.

LuckyWell [14K]

C=8/3 xy

Downloaded Photomath. That app is the best. Shows you how to get the answer along with the answer so you can learn how to do it for test.

6 0

2 years ago

NEED HELP ASAP!!!!!!!!!!!!!!!!!! I'll give Brainliest to whoever can answer all questions :)))

miv72 [106K]

Answer:

the first question would be y= -1/4x + 8

the second one would be 3x + 5y = -65

the third one would be y= -2

and last but not least... the last one would be b.

Step-by-step explanation:

8 0

2 years ago

Read 2 more answers

Solve (-8) to the second power

labwork [276]

Answer:

64

Step-by-step explanation:

8 times 8 is 64, but it is the opposite of positive is negative

3 0

2 years ago

Read 2 more answers