Answer:
a) -6/2
b) -9/2
Step-by-step explanation:
a) rearrange by making y the subject as y = mx+c
 y = -6/2x-9/2 
 
the gradient = -6/2
b) c is the y-intercept as it touch the y-axis, therefore -9/2 is where the line crosses the y-axis
 
        
             
        
        
        
There are 1 rectangle and 2 triangles.
The area of the rectangle is 5 x 7 =35
The are of the triangle is 7 x 2 = 14(1/2) = 7
There are 2 triangles, so 7 x 2 = 14
14 + 35 = 49
49 is your answer
hope this helps
        
                    
             
        
        
        
2x-7 * x
----------- =. 100^2= 10000 
     2
2x^2-7/2= x^2-7/2
x^2-7/2=10000
x^2 = 20007/7