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