Question

2x+3y=10
-6x-9y=30
elmantation method

Answer 1

• First assign any label to the equations:

`{ \tt{2x + 3y = 10 - - - \{eqution \: (a) \}}} \\ { \tt{ - 6x - 9y = 30 - - - \{equation \: (b) \}}} \\`

• Multiply equation (a) by 3

`\dashrightarrow \: { \tt{3 * (2x + 3y = 10)}} \\ \dashrightarrow \: { \tt{6x + 9y = 30}}`

• Sum up the result with equation (b)

`{ \underline{ + { \tt{ \binom{6x + 9y = 30}{ - 6x - 9y = 30} }}}} \\ { \tt{0x + 0y = 60}}`

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