The slope of the line passing through the points (7,5) and (21, 15) is Another line with a slope that is one-third that of the slope you just calculated passes through the origin and the point

answer: none of these answers are correct only the second half is

step-by-step explanation:

27 +27 or 27times 2=54

the diffrence is 0

system of linear equation

step-by-step explanation:

as given in the data

a= 20 , b= -12

let us suppose that it is a straight line equation

now we know the formula for the system of linear equation

b= ma + c )

here m is slope of a straight line which is equal to formula

m=   (ii)

and here c is a constant

now putting the value of a and b in equation (ii)

m=

m=

putting the value of a,b and m in equation (i) gives us

-12 = + c

-12=-12 + c

adding 12 to both sides

-12 +12 = -12 +12 +c

0 =c

or c=0

as the value of the constant is zero which gives us that it is a linear equation and this order pair satisfies the system of linear equations.