Answer:
1. y= -1/4
Step-by-step explanation:
y/5 + 3/10 = (y+2)/7
Get a common denominator for the left hand side
2y/10 + 3/10 = (y+2)/7
(2y+3)/10 = (y+2)/7
Using cross products
(2y+3) *7 = 10*(y+2)
Distribute
14y+21 = 10y+20
Subtract 10y from each side
14y-10y +21 = 10y-10y+20
4y+21 =20
Subtract 21 from each side
4y+21-21 = 20-21
4y = -1
Divide by 4
4y/4 = -1/4
y = -1/4
