In the system -12c+3d=6 and -3c +6d=-9, which expression could you use for substitution

Mathematics

1 answer:

inessss [21]3 years ago

3 0

You can not use either of them because neither of them have a variable= to the eqaution
ex.) y= 3x+25

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X^2/9+2y/7 help me solve

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So firstly, we have to find the LCD, or lowest common denominator, of 9 and 7. To do this, list the multiples of 9 and 7 and the lowest multiple they share is going to be your LCD. In this case, the LCD of 9 and 7 is 63. Multiply x^2/9 by 7/7 and 2y/7 by 9/9:

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