Standart form:
y=mx+n where m is slope, and n is y intercept
y=-3x+n
(2,1) has to right for this equation
x=2, y=1
1=-3*2+n
1=-6+n
1+6=-6+6+n
n=7

(x+9)/5=h
(x+9)*5/5=5*h
x+9=5h
x+9-9=5h-9
x=5h-9

Mx+4y=3c
Mx+4y-4y=3c-4y
Mx=3c-4y
Mx/M=(3c-4y)/M
x=(3c-4y)/M

Standart form
y- 10 = 2(x-8)
y-10+10=2x-16+10
y=2x-6
* an x-intercept is a point on the graph where y is zero
if we take y=0
y=2x-6
2x-6=0
2x-6+6=0+6
2x=6
2x/2=6/2
x=3
*a y-intercept is a point on the graph where x is ze...

3a+{b-2-[(a-b)+(b-1)]}
You should start with inner parenthesis.
3a+{b-2-[a-b+b-1]}=>3a+{b-2-[a-1]}=>3a+{b-2-a+1}
=>3a+{b-a-1}=>3a+b-a-1
=>2a+b-1