Question

2. Find the value of
(i) x, if 4x + 3y = 23 and y = 5
(ii) y, if 3x + y = 15 and x = 4
(iii) x, if 2x + y = 7 and y = -3.

.​

Answer 1

Answer:

(1) the given question is=> 4x + 3y= 23

given=> y=5

replacing the value of y=> 4x + 3*5= 23

4x + 15 = 23

4x = 23 - 15

4x = 8

x = 8/4

x = 2

(2) 3x + y = 15

x = 4

3*4 + y = 15

12 + y = 15

y = 15 - 12

y = 3

(3) 2x + y = 7

y = -3.

2x + (-3) =7

2x-3=7

2x=7+3

2x=10

x= 10/2

x=5

Answer 2

Answer:

1. x=2

2 y=3

3 x=5

Step-by-step explanation:

4x +3y = 23

4x + 3(5) = 23

4x + 15 = 23

4x = 23 -15

4x = 8

x = 8/4

x =2

3x + 2y = 15

3(4) + y = 15

12 + y = 15

y = 15 - 12

y = 3

2x + y = 7

2x + (-3) = 7

2x -3 = 7

2x = 7 + 3

2x = 10

x = 10/2

x= 5