3 years ago

X+7=2y+1 3x-y=7 solve for x and y

Mathematics

1 answer:

vovangra [49]3 years ago

6 0

{x+7=2y+1 ⇔ x-2y=1-7 ⇔ x-2y=-6

{3x-y=7 /*(-2)

{x-2y=-6

{-6x+2y=-14 (+)

x-6x-2y+2y=-6-14

-5x=-20 /:(-5)

x=4

x -2y=-6

4-2y=-6 /-4

-2y=-10 /:(-2)

y=5

Solution: (4; 5)

You might be interested in

PLZZZZZZZZZZZZZZZZZ HELP ME I NEED HELP

lys-0071 [83]

Answer:

1) Matches with option 4

2) Matches with option 2

3) Matches with option 3

4) Matches with option 1

5 0

2 years ago

Read 2 more answers

Which expression is equivalent to 4 square root x10

Likurg_2 [28]

The answer is 40 you do 10 times 4 I hope it helped you you only need to multiply

3 0

3 years ago

this past Sunday, the giants scored 9 less than twice the cowboys. the packers scored 14 points more than the giants. if the tea

Grace [21]

Let the score of cowboys is x
and giants make score 9 which is twice less than the cowboys score so
giants score will be = 2x -9
and packers scored 14 more than giants that is (2x - 9) + 14
now sum of their scores is equal to 81 it means:
x + (2x - 9) + (2x -9) + 14 = 81
x + 2x - 9 + 2x - 9 + 14 = 81
5x = 81 + 4
5x = 85
x = 17
packers scored = (2x - 9) + 14
= 2 (17) -9 + 14
=38 + 5 = 43 points

5 0

3 years ago

The length of a rectangle is 3/2 units greater than its width. If the width is w, which expression gives the perimeter of the re

faltersainse [42]

W+w+(3/2+w)+(3/2+w)=perimeter
4w+6/2=perimeter

7 0

3 years ago

Read 2 more answers

What is - 3x - ( - 2 - 4x ) if x equals 5

m_a_m_a [10]

It would be 7 because -3 times 5

7 0

2 years ago