Step-by-step explanation 7a:
1. solve for your slope using the ordered pairs provided (4,0.25) and (20, 1.25)
(y2-y1)/(x2-x1)= slope
(1.25-0.25)/(20-4)= 1/16=m
2. We know that the y intercept (b) is 0, but to double check plug the ordered pai (0.25, 4) into the slope intercept form y=mx+b and solve for b when your slope is (1/16)
y=(1/16)x+b
0.25=(1/16)(4)+b
0.25=0.25+b
0=b
3. Using this information we can solve for the equation
y=(1/16)x
Step-by-step explanation 7b.
1. plug 56 into your equation in place of x
y=(1/16)(56)
y=3.5