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thicklooney
14.12.2020 •
Mathematics
Solve 3x − 2y = −21 and 2x + 5y = 5 using elimination
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Ответ:
x = -5 and y = 3
Step-by-step explanation:
There are two equations :
3x − 2y = −21 (1)
2x + 5y = 5 (2)
Multiply equation (1) by 2 and equation (2) by 3.
6x - 4y = -42 ...(3)
6x + 15y = 15 (4)
Subtract equation (4) from (3) :
6x - 4y - (6x + 15y) = -42 -15
-4y -15y = -57
-19y = -57
y = 3
Put y = 3 in equation (2) :
2x + 5(3) = 5
2x = 5-15
2x = -10
x = -5
So, the value of x is (-5) and y = 3.
Ответ:
the third one
Step-by-step explanation:
test it out see if im right