Question

Solve : 3x - y = 5 ; 4x - 3y = -1. Hence , find p if y = px - 3​

Answer 1

Answer:

as,

3x-y=5

3x=5+y

X=5+y÷3

put the value of x in equation 2

4x-3y =-1

4×(5+y÷3)-3y=-1

20+4y/3-y=-1

solve after this you will get the value of y after this you can also find x

put in equation y=px-3

Answer 2

Answer:

p = -2.43

Step-by-step explanation:

$3x - y = 5 - - - - - - (1)\\ 4x - 3y = - 1 - - - - - (2)$

multiply 4 with (1),

$12x - 4y = 20$

multiply 3 with (2),

$12x - 9y = - 3$

12x - 4y = 20

12x - 9y = -3 -

5y = 23

y = 23/5

y = 4.6

Substitute y in (1),

3x - 4.6 = 20

3x = 20 + 4.6

3x = 24.6

x= 24.6/3

x= 8.2

if ,

y = px - 3

y= p ×8.2 - 3

y =p × 5.2

4.6= p ×5.2

p= 4.6/ 5.2

p = -2.43