Apoint with an abscissa of 3 belongs to the line which is the graph of the equation 21x–5y=100. find the ordinate of that point.

  -7.4

Step-by-step explanation:

Put the abscissa value into the equation and solve for the ordinate.

  21·3 -5y = 100

  -5y = 37 . . . . . subtract 63

  y = -7.4 . . . . . . divide by -5

here you hope this .

step-by-step explanation:

hypotenuse = √(15² + 8²)

=  √(225 +64)

=  √(289) = 17

sin(x) = cos(y) = 8/17

they are identical so long as you are doing the sine of one angle and the cosine of the only other angle that isn't the right angle.