2. consider a system of two equations in two unknowns: (a) solve this system to produce formulas for the value of r and y (b) let a be the coefficient matrix; a be the matrix produced by replacing first column of the coefficient matrix (corresponding to the variable ) with the constant vector; a, be the matrix pro- duced by replacing the second column of the coefficient matrix (corresponding to the variable y) with the constant vector. find det a, det a, and det a (c) express the values of r and y in terms of these determinants. (this gives a result generally known as cramer's rule)

1. 3. can also be expressed as (22/7)

2. -4.5

3. 3.6

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3

step-by-step explanation:

divide 13.5 by 9 to get the scale factor. it equals 1.5

2 * 1.5 = 3

answer:

given the linear inequality :

add 2y to both sides we get;

simplify:

add 12 to both sides of an equation;

simplify:

divide both sides by 2 we get;

or

the related equation for the inequality equation [1] is;

y-intercepts defined as the graph crosses the y-axis.

substitute x =0 in [2] to solve for y;

y = 6

x-intercepts defined as the graph crosses the x-axis.

substitute value y = 0 to solve for x;

subtract 6 from both sides we get

multiply both sides by 2 we get;

or

x = -12

now, plot these point (0, 6) and (-12, 0) on graph as shown below and shade the graph below the solid line.