what is the value of 3x 4y z when x 2 and y 5（関連順）

2:47

If `3x-4y+z=7,` `2x-z+3y=19 ,` `x+2y+2z=24` , then what is the value of `z` ? (a) 4 (b) 5 (c) 6 ...

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"If `2x+y=5`and `3x-4y=2`, then the value of `2x y`is(a) 4 (b) 6 (c) 8 (d) 10"

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結果 : what is the value of 3x 4y z when x 2 and y 5