Explanation:
(x,y) - x is first number in order pairs, and y is second
1.
x=0
y = -9×0+3 = 0+3 =3
(x,y)=(0,3)
2.
x=10
y=-9×10+3=-90+3=-87
(x,y)=(10,-87)
3.
x=6
y=-9×6+3=-54+3=-51
(x,y)=(6,-51)
4.
(_,30)
y=30
y=-9x+3
30=-9x+3 |-3 subtract 3 from both sides
30-3=-9x+3-3
27=-9x
x=27/-9
x=-3