pearljammarow6ujs
02.11.2019 •
Mathematics
If 3x+20=2y and x+5=y show that (2,7) is a solution solve by substitution. answer me
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Ответ:
3x+20=2y
x+5=y
3(2)+20=2(7)
2+5=7
Ответ:
3x+20=2(x+5)
3x+20=2x+10
minus 2x both sides
x+20=10
minus 20
x=-10
sub back
x+5=y
-10+5=y
-5=y
x=-10
y=-5
(x,y)
(-10,-5)
(2,7) is not a solution
Ответ:
YES bc there all possative and there even numbers!
Step-by-step explanation:
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