Solve the system 2x+3y=18 X-y=-1

Answers

Answer 1

Answer:

Step-by-step explanation:

2x + 3y = 18

x - y = -1

therefore

x = y - 1

we use this identity in the first equation :

2(y - 1) + 3y = 18

2y - 2 + 3y = 18

5y - 2 = 18

5y = 20

y = 20/5 = 4

x = y - 1 = 4 - 1 = 3

Whats 2+2 User: whats 2.3 in a fraction

2 + 2 = 4.

$2.3 * (10)/(10) =\boxed{\bf{(23)/(10) =2(3)/(10)}}$

Answer:

2+2 equals 4 and 2.3 as fraction would be 23/10 or 2 3/10

Step-by-step explanation:

The triangles below are similar from A to B. What is the scale factor? *5/4
3/5
2/3
4/5

Answer: The scale is 5/4

Step-by-step explanation:

To determine the scale factor, you have to locate which sides are similar to each other .

the side length with 20 is congruent to 16

15 is similar to 12 and 10 is similar to 8.

And to get from triangle A to triangle B of any side length, we need to multiply by a certain number which is the scale factor.

And to find that number we will divide the side length of any side in triangle A by the similar side to it in triangle B.

20/ 16 = 5/4

15/ 12 = 5 / 4

10 / 8 = 5/4

The answer would be 5/4 :)

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