Astock can go up, go down, or stay unchanged. how many possibilities are there if you own 7 stocks? how did my textbook get 2187 as the answer?
hello : y =(2/3)x+5
hello : let a(3,7) b(6,9)
the slope is : (yb - ya)/(xb -xa)
(9-7)/(6-3) = 2/3
an equation is : y=ax+b a is a slope
y = (2/3)x +b
the line through point (3,7) : 7 = (2/3)(3)+b
b = 5
the equation is : y =(2/3)x+5
read more on -
the first thing to do is to subtract 16 from both side of the equation:
16 - 16 - b = 7 - 16
the 16s on the left cancel out resulting in:
-b = -9
think of the -b as -1(9). this is multiplication. by doing the inverse operation (division) we can get rid of the negative on the b. we will divide both sides by -1.
this leaves a positive b. since both parts of the right side of the equation are negative it becomes positive ( a negative divided by a negative is a positive).
the final answer is b= 9.
check our work by plugging in the b value (9) into the original equation:
16 - 9 = 7
7 = 7 is true so we now we have the right answer.