Don't need answers, just need explanation how to solve with formulas, ecpecially how to do x nd y intercepts

Question

1. Graph inequality on a plane
y>x-4
i have to shade a section above or below line made

2. Graph the equation using the slope and y-intercept
y= 5/4x+2
need coordinates to plot line

3. find equation of the line that contains the given
pair of points. (-11,1), (-9,-3)

4. Find the slope and y-intercept of the line
-3x-5y=15

5. Use intercepts to graph the eqaution
-x+4y=8

6. Sarahs investment grew 24% to $310. How much did
she invest?

7. What % of 220 is 44?

8. What 25% of 780?

9. Solve for r.
q+r+i
Y= ------
6

10. -3/7 divided by (-2/3)

Answer 1

1) graph the line x - 4
on the line y = x-4, so below the line y < x-4

2) for instance y-intercept, that is where x = 0 , then y= 5/4x+2 and x=0, thus y = 2.
y intercept is at (0,2).

x-intercept is when y = 0 thus 0 = 5/4x + 2 thus -2 = 5/4x thus x = -2 *4/5=1.6