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Mgarcia325
22.09.2019 •
Mathematics
Solve the system of linear equations below.
4x - 3y = 17
5x + 4y = 60
a.
x = 2, y = -3
b.
x = 5, y = 8
c.
x = 8, y = 5
d.
x = -8, y = -5
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Ответ:
x = 8 y = 5
Answer C
Step-by-step explanation:
4x - 3y = 17 Multiply by 4
5x + 4y = 60 Multiply by 3
(4x - 3y = 17)*4
16x - 12y = 68
(5x + 4y = 60)*3
15x + 12y = 180
Add the 2 new equations together
16x - 12y = 68
15x + 12y = 180
31x = 248 Divide by 31
31x/31 = 248/31 Divide
x = 8
4*8 - 3y = 17 Substitute 8 for x
32 - 3y = 17 Subtract 32 from both sides.
32-32 - 3y=17-32 Combine
-3y = - 15 Divide by -3
-3y/-3 = -15/-3
x = 5
Ответ:
23456789
Step-by-step explanation: