multiply both sides by 5 3(15k+10)=5(12k-9)
get rid of the brackets 45k+30=60k-45
take away 45k to both sides 30=15k-45
plus 45 to both sides 75=15k
divide both by 15 k=5

8 0

3 years ago

8x-5y=15 6x+4y=43 solve the system by any method

Sedbober [7]

Answer:

$x=\frac{275}{62}$ , $y=\frac{127}{31}$

Step-by-step explanation:

<h3>I will use the elimination method.</h3>

We want to make the X's the same:

$24x-15y=45$

$24x+16y=172$

Because the signs of the X's are the same we subtract the 2 equations to make:

(I put the second one on top of the 1st)

$31y=127$

So:

$y=\frac{127}{31}$

Substitute y into either equation 1 or 2:

(I chose equation 1)

$8x-5(\frac{127}{31})=15$

$8x=5(\frac{127}{31}) + 15$

$x=\frac{5(\frac{127}{31})}{8}$

So:

$x=\frac{275}{62}$

5 0

2 years ago

Nate walk 11 miles in 4 hours. At what unit rate does Nate walk?

coldgirl [10]

Answer:

2.75 or 2 3/4

Step-by-step explanation:

just divide 11/4 that's how many miles Nate walked every hour

4 0

3 years ago

3/2 dived by 7/8 dived by 1/2

Leviafan [203]

Answer:

3.428571429 or approximately 3.43

Step-by-step explanation:

3/2

= 1.5

7/8

= 0.875

1.5/0.875

= 1.714285714

1.714285714/0.5

= 3.428571429

or approximately 3.43

6 0

3 years ago

Find the distance between the points (4/4,1/10) and (2/5,7/10)​

Find the distance between the points (4/4,1/10) and (2/5,7/10)