We just need to substitute in 6 whether we see an x:
(7*6) - 4*(6-6) + 12
= 42 - 4*0 + 12
=54
15 more. There are 3 guppies and 18 goldfish. Because 3+18=21 and 3x6=18
So first, we want to substitute in 15 to all the x variables.
So,
3x - 8y = 5
Becomes
3 * 15 - 8y = 5
Or,
45 - 8y = 5
So here, you can subtract 45 from both sides to move all like terms to one side.
-8y = 5 - 45
And then simplify:
-8y = -40
Then divide both sides by -8
y = 5
Given h is the height, H is the hypotenuse and A is the base angle,
then Sin(A) = h/H
so h = HSin(A)
