Answer is y=6x
Step-by-step explanation
When you have a graph, you can find the slope or coefficient next to x, by finding rise over run on the graph or using slope formula.
On the graph, from 0, 0, we go up or rise +6 and go right or run +1. Slope is 6/1 or 6.
Or, you have (0, 0) and (1, 6) as two definite points. Using slope formula
y2 - y1 over x2 - x1
6 - 0 over 1 - 0 = 6/1 or slope of 6.