I assume you want to find a line with a slope of 4/5 passing through (2,7).
Slope intercept form is y=mx+b, where m is slope and b is y intercept. (in a line, x and y will be left as x and y).
You know the slope, so now you have y = (4/5)x + b.
Now you need to find the value of b.
They gave you a coordinate x and y, so substitute that in as x and y in the equation and solve for b.
(7) = (4/5)(2) + b
b = 5.4, or 27/5
Sow now put b back in to the equation, and you final answer is
y = (4/5)x + 27/5
