I would use * for multiplication, not x; or you can use implied multiplication or parentheses. Your notation is, I think, messing you up.
I have a problem with this question, Can any tell me if i did anything wrong in this question? and give me clues on how to proceed from where i left off
y=d*(tan(32)) Equation 1
y=d*(tan(69)) - 7.8 Equation 2
Sub equation 1 into equation 2
d*tan(32) = d*(tan(69)) - 7.8
That's where i'm stuck at the moment, i don't really know if my working out is correct, can anyone help me?
I'm trying to find "d" by the way
Thank You! Just one last question, for this kind of trigonometry question where i have to unknown values, is there like some kind of name for it? Like finding an unknown using substituion or something? Because i think i should do more of these questions.
Sure. I would say you had two equations in two unknowns. In this case, your equations were linear, so you could have used either substitution or elimination. You used substitution (that was where you set the two equations equal to y equal to each other).