katiebonar13
28.05.2021 •
Mathematics
3x - 2y = 20
3x - 5y = 5
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Ответ:
X=10, y=5
Step-by-step explanation:
3x-2y=20 equation 1
3x-5y=5 equation 2
subtract equation 1 from 2
automatically 3x will cancel out
-2y-(-5y)=20-5
-2y+5y=15
3y=15
y=5
sub 5 for y in eqn 1
3x-10=20
3x=30
x=10
Ответ:
C. 1
Step-by-step explanation:
Commutative property says that changing the order of the operands does not change the result. This can be expressed as:
Using the previous information, we can say:
And rewrite the equation as:
Since the numerator and denominator are the same: