Question

solve 2x+y=-2; 3x-y=7 in simultaneous method​

Answer 1

Answer:   x=1;y=--4

Step-by-step explanation:

By Eliminating Method :

2x+y=--2 ⇒⇒(i)

3x-y=7⇒⇒(ii)

adding (i) and (ii),we get

5x=5

x=5/5 ; x=1                  

x=1 in (i),     2(1)+y=--2

2+y=--2

y=--2--2  

y=--4Answer:   x=1;y=--4

Answer 2

Answer:

2x+y=-2   -1.

3x-y=7   -2.

solving the equation by substitution method-

find the value of x from equation 1.

$2x+y= -2\\\\x=\frac{-2-y}{2}$

putting value x in equation 2.

3x-y=7

$3x-y=7\\3(\frac{-2-y}{2})-y =7\\ \\\frac{-6-3y}{2}-y=7\\ \\\frac{-6-3y-2y}{2} = 7\\\\\\\frac{-6-5y}{2} = 7\\\\-6-5y=14\\-5y=20\\\\\\\y=\frac{20}{-5} = -4$

Step-by-step explanation: