Question

solve the following simultaneous linear equation
2x+3y =18 , x+y= 7​

Answer 1

Step-by-step explanation:

$2x + 3y = 18 \\ x + y = 7 \\ x = 7 - y \\ 2(7 - y) + 3y = 18 \\ y + 14 = 18 \\ y = 4 \\ x = 3$

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Answer 2

Answer:

2x+3y=18(1)

x+y=7(2)

Multiplying equation (2) by 2, we get

2x+2y=14(3)

Subtracting equation (3) from (2), we get

Y=4

Using this in x+y=7, we have

x+4=7

Or x=7-4=3

x=3