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Sax=b / ÷ Sa
x= b/Sa
b)t=1/abx /× 1
1t=abx / ÷ ab
1t/ab=x
c)y=2t-3x / +3x
3x+y=2t /-y
3x=2t -y /÷3
x=2t-y/3
d)y=2(x-1)
y=2x-2 /-2x
-2x+y=-2 /-y
-2x=-2-y / ÷ (-2)
x= -y
e)y= x- 1/2 / -x
-x +y = -1/2 / -y
-x=-1/2 -y / × (-1)
x=1/2 +y
f)y=2/x-1 / × 2
2y=x-1 /+1
x=2y +1
g)P=⅓(a²+2ax)
P=⅓a² + ⅓2ax /× 3
3P=a² + 2ax / -a²
3P - a²=2ax /÷ 2a
x=3P - a²/2a
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