lilquongohard
27.06.2019 •
Mathematics
What is the solution to the system of equations? use the linear combination method. {2x−3y=9 {3x+5y=4
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Ответ:
{3x+5y=4
2. {(2x−3y=9)×5
{(3x+5y=4)x3
3. {10x-15y=45
{9x+15y=12
4. (10x-15y=45) + (9x+15y=12)= (19x=57)
5. (19x=57)÷19
6. x=3
7. 2(3)-3y=9
8. 6-3y=9
9. -3y=9-6
10. (-3y=3)÷(-3)
11. y=-1
x=3 and y=-1
Ответ: