Question

Solve the following simultaneous equations graphically.

1. 2x + 3y = 12 ; x – y = 1

2. x – 3y = 1 ; 3x – 2y + 4 = 0

3. 5x – 6y + 30 = 0 ; 5x + 4y – 20 = 0

4. 3x – y – 2 = 0 ; 2x + y = 8

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Answer 1

Step-by-step explanation:

2x+3y=12

x- y=1

multiply 2nd equation by 2

2x-2y=2............eqn3

2x+3y=12...........eqn2

subtract eqn 3 and 2

-y=-10

y=10

substitute the value of y in 2 eqn

x - y = 1

x - 10=1

x=1+10

x=11