tonehasarathi
19.10.2019 •
Mathematics
Which systems of linear equations has the ordered pair(4,-5)as a solution?
a)2x-5y=-30 and 7x+4y=-19
b)6x-y=-29 and 8x+3y=-17
c)3x-2y=22 and 2x+9y=-37
d)5x-6y=49 and x+8y=-27
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Ответ:
The answer is C
Step-by-step explanation:
3x-2y=22 and 2x+9y = -37
Ответ:
=
10 minutes x minutes
Cross multiply
2x=30
divide both sides by 2
x=15 minutes
Answer=15 minutes