Answer: y = 6x + 20, or E = 6t + 20
Explanation:
Taking two points on the graph, (10, 80) and (30, 200), you can find the slope ("E") with the equation (y2-y1)/(x2-x1), which when plugged into the formula would be (200-80)/(30-10) = 120/20 = 6. To get your "t", you would plug this back into the formula y=mx+b along with any point on the graph, which would be:
80 = 6(10) + b
80 = 60 + b
b = 20
So the final equation should be y = 6x + 20