oscarruiz
28.04.2021 •
Mathematics
When solving the following system of equations by substitution what would be a
correct first step?
{x=y- 7 3x + 15y =- 1
A. 3x + 15 (y - 7) = - 1
B. 3(y – 7) + 15y = - 1
C. 3x + 15y (y - 7) = -1
D. 3x(y – 7) + 15y = -1
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Ответ:
15a = 15a - 4
0 = - 4