Y=7x+3 because slope intercept form is y=mx+b where x is the slope and b is the y intercept so when you plug in the slope of 7 and the y intercept of 3 you get the equation y=7x+3.
An irrational number can be written as a decimal, but not as a fraction and a rational number is a number that can be written as a ratio. That means it can be written as a fraction
