justaboy1817
26.01.2021 •
Mathematics
If 7x−6y=2 and −2x−y=3 are true equations, what would be the value of 5x−7y?
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Ответ:
-55
Step-by-step explanation:
7x-6y=2
-2x-y=3
by substitution method
y=3+2x
7x-6(3+2x)=2
7x-18-12x=2
-5x=20
x=-4
-2(-4)-y=3
8-y=3
-y=3-8
y=5
therefore the value of x=4 and that of y=5
5x-7y=5(-4)-7(5)
=-20-35
=-55
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