6(10+z+3)
= (6)(10 + z +3)
= (6)(10) + (6)(x) + (6)(3)
= 60 + 6x + 18
= 6x + 78
For any y-intercept, the x-coordinate is zero. This is something to bear in mind to start with.
Now to find the y-intercept, find g(0) = -2.
Therefore the answer is (0,-2)
Find the y-intercept then model it into y = .71x + b (b is the y-intercept).
we can use formula

we can compare
we get
a=x
b=2
now, we can plug that in formula
and we get

now, we can simplify it
...........Answer