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iren [92.7K]
3 years ago
6

If 8x−4y=20 and 4x−8y=4, what is the value of x−y

Mathematics
1 answer:
olga nikolaevna [1]3 years ago
6 0

Answer:

x-y=3-1=2

Step-by-step explanation:

8x-4y=20                            4x-8y=4

8x=20+4y                            4(\frac{20+4y}{8})-8y=4

 x=\frac{20+4y}{8}                                               \frac{80+16y}{8} -8y=4

 x=\frac{20+4}{8}                                                10+2y-8y=4

x=\frac{24}{8}                                                 10-6y=4

x=3                                                  -6y=4-10

                                                   -6y=-6

                                                    y=1<u></u>

so x-y=3-1=2

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