Math, asked by mrabdulrub786, 11 months ago

Solve x+y=7,12x+5y=7 using cross multiplication method?

Answers

Answered by Anonymous
8

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x + y = 7 eqn 1

X = 7y

5x + 12y = 7 eqn 2

put X = 7y in eqn 2

5 (7y) +12y = 7

35 + 12 = 7

7y = 12- 35

7y = -28

y = 7/(-28)

y = -3

put y in eqn 1

X + -3 = 7

X = 7 - (-3)

X = 7 +3

X = 10

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