davisnaziyahovz5sk
11.10.2020 •
Mathematics
Solve the following system of equations.
6x -5y=13 & 9y-15+2x=0
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Ответ:
x = 3
y = 1
Step-by-step explanation:Hi !
6x - 5y = 13
9y - 15 + 2x = 0
6x - 5y = 13
2x + 9y = 15 | ×(-3)
6x - 5y = 13
- 6x - 27y = - 45
add
6x - 6x - 5y - 27y = 13 - 45
- 32y = - 32 | ×(-)
32y = 32
y = 1
replace y = 1
6x - 5(1) = 13
6x - 5 = 13
6x = 13 + 5
6x = 18
x = 3
Good luck !
Ответ:
112.3
Step-by-step explanation:
A = 9 × 8.7 + 2(8 + 9) = 112.3