Answer:
- h: x - y = -3
- k: 4x +y = 12
Explanation:
You want linear equations in standard form that describe the relations in the given tables.
Standard form
A useful two-point formula for creating an equation in general form is ...
(y2 -y1)(x -x1) -(x2 -x1)(y -y1) = 0
This will simplify to an equation of the form ...
ax +by +c = 0 . . . . . . general form equation for a line
The corresponding standard form equation is ...
ax +by = -c . . . . . . . . standard form equation for a line
The standard form has mutually prime coefficients and a positive leading coefficient. That may require removal of any common factors.
Line h
(2 -(-2))(x -(-5) -(-1 -(-5))(y -(-2)) = 0
4x +20 -4y -8 = 0 . . . . . . . . coefficients have a common factor of 4
x -y +3 = 0 . . . . . . . . . general form
x -y = -3 . . . . . . . . . standard form
Line k
(12 -20)(x -(-2)) -(0 -(-2))(y -20) = 0
-8x -16 -2y +40 = 0 . . . . . . coefficients have a common factor of -2
4x +y -12 = 0 . . . . . . . . simplified to general form
4x +y = 12 . . . . . . standard form
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Additional comment
Another useful form of the equation of a line is "intercept form":
x/a +y/b = 1 . . . . . . . where 'a' is the x-intercept and 'b' is the y-intercept
The table for line k shows the x-intercept is (3, 0) and the y-intercept is (0, 12). Then the line can be written as ...
x/3 +y/12 = 1
Multiplying by 12 gives ...
4x +y = 12 . . . . the required standard form