robertalfa23ow8xa8 robertalfa23ow8xa8

02-04-2020
Mathematics

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If 5x + 3y = 12 and 4x - 5y = 17, what is y?

Respuesta :

ghanami ghanami

03-04-2020

Answer:

y=-1

Step-by-step explanation:

5x + 3y = 12 ....(*)

4x - 5y = 17....(**)

multiply (*) by : -4 and(**) by 5

you have : -20x -12 = -48.....(1)

20x -25y = 85....(2)

add(1) and(2) : -37y = 37 so : y =37/-37= -1

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