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If x + 1 = y - 8 and x = 2y, then find x + y.

 Jun 12, 2020
 #1
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hey guest!
 

so we can express x as 2y. so the first equation becomes 2y+1=y-8.

 

2y+1=y-8

2y+9=y

y+9=0

y=-9

 Jun 12, 2020
 #2
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we simplify by subtracting 1 from both sides to get x=y-9 so we get that y is 9 more than x and also is 2 times x so y=-9 and x=-18

 Jun 12, 2020

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