System of equations F2 cos20F1cos6015cos30 745 F2 sin2015sin

System of equations. F2 cos(20)+F1cos(60)=15cos(30) +7(4/5) F2 sin(20)+15sin(30)=4.2+F1Sin(60) I posted this question already and got the answer. I really just need to see the system of equation steps. mostly the part where one variable is substituted in and you have two of the same variable. Please show how you get from two F1s back to one etc. thanks

Solution

since second equation only contain F1 and ( does not contain F2), the type of sustitution steps you are willing to find can not be obtained. in the type of substitution you have asked for needs two equations with both the variables so that one variable can be expressed in terms of the other in single equation and then the expression has to be put into another equation. in that way the equation then becomes of the single variable and then can be solved for the same.