When graphing a linear function in slope-intercept form, why do you have to plot the y-intercept first? why can't you use the slope first?

This is so harddd! solve. 1 + 1 = solve 4 + 4 = solve 3 x 3

This is different from the first one can someone me

The manufacturer of a new product developed the following expression to predict the monthly profit, in thousands of dollars, from sales of the productwhen it is sold at a unit price of x dollars.-0.5x^2 + 22x - 224what is represented by the zero(s) of the expression? a. the profit when the unit price is equal to 0b. the unit price(s) when the profit is equal to 0c. the profit when the unit price is greatestd. the unit price(s) when profit is greatest