If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
Y-8 = (a/2)*(x-a) // - (a/2)*(x-a)
Y-((a/2)*(x-a))-8 = 0
Y-1*1/2*a*(x-a)-8 = 0
Y-1*1/2*a*(x-a)-8 = 0
Y+1/2*a^2-1/2*a*x-8 = 0
Y+1/2*a^2-1/2*a*x-8 = 0
Y-1/2*a*x+1/2*a^2-8 = 0 // - Y+1/2*a^2-8
-1/2*a*x = -(Y+1/2*a^2-8) // : -1/2*a
x = (-(Y+1/2*a^2-8))/(-1/2*a)
x = -2*a^-1*(8-Y-(1/2*a^2))
x = -2*a^-1*(8-Y-(1/2*a^2))
| 3m^2-9=5 | | -5x+8(-4x+4)=3x+32 | | (-r+s)+(s-r)=0 | | -6(-6x+5)=-318 | | -6x-66=x+44 | | 4(4)+x=7(7) | | 2x^5+24=14x^3 | | 4z-3=1/2(7z-1) | | (r-s)+(s-r)=0 | | -12=-7+5x | | y/9=40/72 | | 10v-17v=4 | | 2v^2-19v+24= | | (-4+x)=6 | | 35=a(a-2) | | 2x+1.6=3.8 | | -(2h-9)-4h=0 | | 4squared+xsquared=7squared | | 11/12-5 | | 75+105+2x-1+x=360 | | 3k=-48 | | 5t-20=(3t+1) | | (x+45.87)=60.54 | | xsquared=50 | | 4r^2+23r=35 | | 3x-11+2x-11+2y=180 | | 5(-5x+13)=-60 | | x^3-3x^2+5x-15= | | 5-5x+6+2x+4x-5=1+4*3 | | 5(x-0.9)=-3.5 | | 5(t-3)=-80 | | A/4--5/6=-1/2 |