Question

find the value of x and y when 5x + 3 y=12,2x-y=7 ans pls

Answer 1

5x+3y=12 (i)
2x-y= 7 (ii)
from equation (ii) we will take out the value of x,
2x-y = 7
2x = 7+y
x = (7+y)/2

we will substitute this value in equation (i)
5[(7+y)/2] +3y = 12
(35+5y)/2+3y = 12
(35+5y+6y)/2 = 12
35+11y = 24
11y = 24-35 = -11
y = -11/11 => -1
if y = -1 then x =
2x-y=7
2x-(-1)= 7
2x+1=7
2x = 6
x = 6/2 = 3
hope this helps

Answer 2

this is a simultaneous equation:-

5x+3=y
2x-y=7

There are two ways of solving this:-
1. Elimination Method
2. Substitution Method

1. 5x - y =-3---1
    2x - y = 7---2

Subtract equation 2 from equation 1

     5x - y=-3
     2x - y=7
=> 3x=-10
=> x= -3.33333

y= 5x+3
  = 5(-3.33333)+3
  = -16.66666+3
  = -13.66666

∴ x=-3.33333
   y= -13.66666

2. if 5x+3=y
     2x-5x-3=7
=> -3x=10
=> x=-3.33333
y=5(-3.33333)+3
  = -16.66666+3
  = -13.66666

∴y=-13.66666
  x= -3.33333