Answer:
7x-7=y
Step-by-step explanation:
5x+7y=10
5x-10=10-7y-10
5x-10=-7y
(1/7)5x-10=7y(1/7)
5x/35-10/70=y
<em>Sana</em><em> </em><em>maka</em><em>tulong</em><em> </em>
x = 31°
4
pythagoras theorem = a* + b* = c* ( by '*' i mean squared)
2* + b* = square root twenty
4 + b* = 20
b* = 16
b = 4
