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04 Jun 2021, 04:15
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If \(-5x+2y=9\) and \(3x-4y=-4\), then what is the value of \(7x+10y\)?
A. -19
B. -17
C. -9
D. 9
E. 19
A. -19
B. -17
C. -9
D. 9
E. 19
04 Jun 2021, 04:53
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−5x+2y=9 So -10x+4y = 18
Adding -10x + 4y=18 and 3x−4y=−4, -7x =14 so x = -2
Putting x = -2 in -5x + 2y = 9, we get y = -1/2
The value of 7x + 10y = 7 (-2) + 10 x (-1/2) = -14 - 5 = -19
The answer is A -19
Adding -10x + 4y=18 and 3x−4y=−4, -7x =14 so x = -2
Putting x = -2 in -5x + 2y = 9, we get y = -1/2
The value of 7x + 10y = 7 (-2) + 10 x (-1/2) = -14 - 5 = -19
The answer is A -19
04 Jun 2021, 07:52
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LaveenaPanchal
−5x+2y=9 So -10x+4y = 18
Adding -10x + 4y=18 and 3x−4y=−4, -7x =14 so x = -2
Putting x = -2 in -5x + 2y = 9, we get y = -1/2
The value of 7x + 10y = 7 (-2) + 10 x (-1/2) = -14 - 5 = -19
The answer is A -19
Adding -10x + 4y=18 and 3x−4y=−4, -7x =14 so x = -2
Putting x = -2 in -5x + 2y = 9, we get y = -1/2
The value of 7x + 10y = 7 (-2) + 10 x (-1/2) = -14 - 5 = -19
The answer is A -19
Hi! How did you get this value? -10x + 4y=18? WHy did you multipy all numbers by 2?
