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lubasha [3.4K]
4 years ago
15

X(4)-20=72 what is the missing number

Mathematics
1 answer:
Elis [28]4 years ago
5 0

Answer:

23

Step-by-step explanation:

(4 x 23) -20 = 72

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Step-by-step explanation:

You can solve the system of equations by the method of substitution:

- You must susbtitute the second equation into the first equation and solve or x:

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- Now, you must susbtitute the value of x obtained above into the second equation to calculate the value of y. Then, you have:

y=\frac{2}{9}+1\\\\y=\frac{2+9}{9}\\\\y=\frac{11}{9}

Therefore, you obtain:

(\frac{2}{9},\frac{11}{9})

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