Question

2 points
If 2x +y = 35,2x – 3y - 15 = 0 then x, y are respectively
a) -15,5
b) 15,5
c)5,15
d)-15-5
a
Ob
O

Answer 1

Answer:

b is correct

Step-by-step explanation:

from 1

2x+y=35

y= 35-2x

from 2

2x-3y=15

2x- 3(35-2x)=15

2x- 105 + 6x= 15

8x= 120

x= 120/8

x= 15

y= 35-2x

y= 35-2×15

y= 5

x=15 ,y=5

Answer 2

Answer:

Given ,

2x + y = 35 --------(1)

2x - 3y - 15 = 0 ---------(2)

From ( 1 )

$2x + y = 35 \\ \\ = > y = 35 - 2x$

๛ Putting back the value of y in ( 2 ) , we get :

$2x - 3y - 15 = 0 \\ \\ = > 2x - 3(35 - 2x) - 15 = 0 \\ \\ = > 2x - 105 - 6x - 1 5= 0 \\ \\ = > 4x - 120 = 0 \\ \\ = > 4x = 120 \\ \\ = > x = \frac{120}{4} \\ \\ = > x = 30$

๛ Putting back the value of x in ( 1 )

2 ( 30 ) + y = 15

=> 60 + y = 15

=> y = 15 - 60

=> y = - 45

So x = 30 and y = - 45

# keep smiling ☺