What is the y-value of the solution to the system of equations? 3x + 5y = 1 7x + 4y = −13

1 answer:

6 0

3x + 5y = 1 . . . . . . . . (1)
7x + 4y = -13 . . . . . . .(2)
(1) x 7: 21x + 35y = 7 . . (3)
(2) x 3: 21x + 12y = -39 .(4)
(3) - (4) = 23y = 46
y = 46/23 = 2

You might be interested in

7/8 = ?/48<br> A.13<br> B. 1<br> C. 42<br> D. 6

Ugo [173]

Hi Brainiac

7/8 =?/48

Let's replace the unknown place by x

7/8 = x/48

Cross multiply

(7)(48)= (X)(8)

336 = 8x

Flip it

8x = 336

Divide both sides by 8

8x/8 = 336/8

x= 42

The answer is C

Now if you wanna see if the answer is good just replace 42 in blank space

7/8 = 42/48

Now didivde 7 by 8 and divide 42 by 48

7/8= 0.875

42/48= 0.875

The answer C is correct

I hope that's help:)

If you have questions please let me know :)

4 0

3 years ago

Find the slope of the line passing through the two points.

pogonyaev

Formula for slope: y2-y1/x2-x1
Plug in values.
3-8/-4-(-7)= -5/3 = slope
42-1/36-12=41/24=slope

6 0

3 years ago

What is the value of tan M?

ludmilkaskok [199]

Hi there! The answer is 15/8.

The general formula for the tangent is
$\tan(m) = \frac{opposite}{adjecent}$

When we fill in the data from the picture, we get the following:
$\tan(m) = \frac{15}{8}$