ellietalbot
25.09.2021 •
Mathematics
S -4x + 3y = 23
1. Identify a solution to this system of equations:
x- y=-7
A. (-5,2)
- 2
B.(-2,5)
C. (-3,4)
D.(4,-3)
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Ответ:
(-2, 5)
Step-by-step explanation:
-4x+3y=23
x - y = - 7
x = y - 7
Substitution:
-4(y-7)+3y = 23
- 4y + 28 + 3y = 23
y = 23 - 28
-y = -5
y = 5
Substitution:
x - 5 = - 7
x = - 7 + 5
x - 2
Ответ: