The simpliest way to do this is to turn both fractions into decimals
7/10 goes to 0.7 and 2/5 goes to 0.4
then the equation would be 0.7x + 20 = 0.4
hope I've helped!
X-intercept: (3.5,0)
Y-intercept: (2.5,0)
I don’t think those are similar... not 100% sure tho. I think they need 2 matching angles to be similar.