formulas

y = 3x	x	y
	15	45
	13	39
	11	33
	9	27
	7	21
	5	15
	3	9
	1	3
	-1	-3
	-3	-9
	-5	-15
	-7	-21
y=16x	x	y
	0	0
	-1	-16
	-2	-32
	-3	-48
	-4	-64
	-5	-80
	-6	-96
	-7	-112
	-8	-128
	-9	-144
	-10	-160
	-11	-176
y=9x+6	x	y
	0.5	10.5
	0.7	12.3
	0.9	14.1
	1.1	15.9
	1.3	17.7
	1.5	19.5
	1.7	21.3
	1.9	23.1
	2.1	24.9
	2.3	26.7
	2.5	28.5
	2.7	30.3
	2.9	32.1
	3.1	33.9
	3.3	35.7
y=0.8x+0.5	x	y
	-0.8	-0.14
	-0.5	0.1
	-0.2	0.34
	0.1	0.58
	0.4	0.82
	0.7	1.06
	1	1.3
	1.3	1.54
	1.6	1.78
	1.9	2.02
	2.2	2.26
	2.5	2.5
	2.8	2.74
	3.1	2.98
	3.4	3.22