Question

solve the following simultaneous equations by graphically .
X + y =0 ; 2x - y = 9​

Answer 1

Answer:

x + y = 0 ...................1

2x - y = 9 ................2

Add equation 1 and 2,

x + y = o

+ 2x - y = 9

3x 0 = 9

x = 9/3

x = 3

Place x = 3 in equation 2,

2x - y = 9

2(3) - y = 9

6 - y = 9

- y = 9 - 6

- y = 3

y = - 3

(x , y) = (3 , - 3).

Answer 2

Answer:

here's the answer

Step-by-step explanation:

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