Question

7x+3y=15
-15x+12y=39
solve by Cramer's rule​

Answer 1

Answer:

multiple 1st equation with -15

after multiple 2nd equation with 7

-15(7x+12y=15)

-105x+180y=225••••••••1st

7(-15x+12y=39)

105x+84y=273•••••••2nd

next step is 1st - 2nd

-105x+180y=225

-105x+ 84y=273

+ - -

_____________

0 + 96y = -48

y=-48 ÷ 96

y=-0.5

substitute vale of y in place of y and then solve

therefore x = 2.3

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