How is the graph of y = 3x^2 + 7 different from the graph of y = 3x^2?

Find the x-intercept and y-intercept of the line. 3x + 5y = −15

How do you use the elimination method for this question? explain, because i really want to understand!

The chs baseball team was on the field and the batter popped the ball up. the equation b(t)=80t-16•16+3.5 represents the height of the ball above the ground in feet as a function of time in seconds. how long will the catcher have to get in position to catch the ball before it hits the ground? round to the nearest second