kk. ill explain it.
in any graphing problem, you want to get it in y=mx+b form. m=slope and b= y-intercept.
so fist simplify the problem by subtracting 4 from both sides to get y by itslef.
now the problem is y=2(x-6) - 4
simplify 2(x-6) and now you have
y=2x - 12 - 4
now add -12 and -4 together and you have
as mentioned before in y=mx + b form, m = slope. so 2 is the slope.
hope this helped!