Express the column matrix b as a linear combination of the columns of a. (use a1, a2, and a3 respectively for the columns of a.) a = −3 1 −1 2 1 3 , b = −5 7

the formula of a slope:

we have the points (-2, 7) and (2, 3). substitute:

the second option

step-by-step explanation:

option (a)

step-by-step explanation:

step 1:   take 2 number whose product equal to 25..

and sum of those two number are -10

step: 2 for example here if we take 5,5 are the number,,

5*5=25

and

5+5=10

but we need -10

so if we take   -5,-5

so -5*-5=25

and -5+(-5)=-10

s0

come the equation

replace -10x by these number

like -5x -5x+25

take common

x(x-5)-5(x-5)=0

(x-5)(x-5)=0