3 years ago

Solve -5 = x - 3y Solve 11 = -3x + 7y

Mathematics

1 answer:

Talja [164]3 years ago

4 0

Answer:

x=1, y=2. (1, 2).

Step-by-step explanation:

x-3y=-5

-3x+7y=11

----------------

x=3y+(-5)

x=3y-5

-3(3y-5)+7y=11

-9y+15+7y=11

-2y=11-15

-2y=-4

2y=4

y=4/2

y=2

x-3(2)=-5

x-6=-5

x=-5+6

x=1

You might be interested in

18. Solve the equation. m- 10/3 - 5m-9/7 = 1

JulijaS [17]

The answer is m = -59/42

Step by step explanation is in the image below.

4 0

3 years ago

In a bag of marbles 12% were blue 18% were green and the rest were purple if the bag has 150 marbles how many were blue or green

baherus [9]

Answer:

Step-by-step explanation:

12 % of the marbles are blue, and

18 % of the marbles are green, so

30 % of the marbles are either blue or green.

There are 150 marbles.

30 % × 150 = 0.30 × 150 = 45

The number of blue or green marbles is 45.

8 0

2 years ago

It is 1:45 25min later what time is it

marusya05 [52]

Answer:

The answer is 2:10

Step-by-step explanation:

60 mins in an hour. 1:45+25 is 1:70, turn that into ours and you get 2:10.

3 0

2 years ago

Read 2 more answers

Hiiiooo! Can someone please help me if you can’t see the picture I will gladly explain it in the comments!

Neporo4naja [7]

Answer:

Step-by-step explanation:

6 0

2 years ago

Circle the volume in cm^3 of a cylinder with the radius 5cm and height 8cm

Phantasy [73]

Answer:

628 $cm^{3}$

Step-by-step explanation:

Since the formula to find the volume of a cylinder is $\pi r^{2}$ h, we just need to fill things in.

Since the radius is 5 and the height is 8 and we know that pi=3.14, our new equation is:

3.14*5^2*8.

5*5=25. Now we simplify.

3.14 * 25 * 8

78.5 * 8

628 $cm^{3}$

Hope this helps!! <3 :)

6 0

2 years ago

Read 2 more answers