lol15arec001
16.10.2019 •
Mathematics
What dose 3x-5y=15 and 2x-y=-4 really equel
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Ответ:
2x - y = -4 >2
multiply eqn2 by -5 and add eqn 1
3x-5y = 15
-10x +5y = 20
-7x = 35
x = -5
sub in eqn 2
2(-5) - y = -4
-10 - y = -4
-y = -4+10
-y = 6
y = -6
so the answer is (-5, -6)
Ответ:
Ответ:
20 =x
Step-by-step explanation:
The angles are vertical angles and vertical angles are equal
x+40 = 3x
Subtract x from each side
x+40-x = 3x-x
40 = 2x
Divide by 2
40/2 = 2x/2
20 =x