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serious [3.7K]
3 years ago
15

3x+y=15 5x-4y=8 resolucion de sistema por el metodo de sustitucion

Mathematics
1 answer:
Brrunno [24]3 years ago
8 0

Answer:

x=4

y=3

Step-by-step explanation:

we have the following equations

3x+y=15  equation 1

5x-4y=8  equation 2

using equation 1 we have:

y=15-3x equation 3

using equation 3 in equation 2 we have:

5x-4(15-3x)=8

5x-4*15+4*3x =8

5x-60+12x = 8

17x=68

x=68/17

so we have x=4

finally in equation 3:

y = 15-3(4)

y = 15-12

y = 3

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