Answer:
The system of equations has a one unique solution
Step-by-step explanation:
To quickly determine the number of solutions of a linear system of equations, we need to express each of the equations in slope-intercept form, so we can compare their slopes, and decide:
1) if they intersect at a unique point (when the slopes are different) thus giving a one solution, or
2) if the slopes have the exact same value giving parallel lines (with no intersections, and the y-intercept is different so there is no solution), or
3) if there is an infinite number of solutions (both lines are exactly the same, that is same slope and same y-intercept)
So we write them in slope -intercept form:
First equation:

second equation:

So we see that their slopes are different (for the first one slope = -6, and for the second one slope= -3/2) and then the lines must intercept in a one unique point. Therefore the system of equations has a one unique solution.
Answer:
54.36
Step-by-step explanation:
Cos
Answer:



Step-by-step explanation:
The sum of angles in a triangle is 180 degrees
(a)Given the angles 40° and 50°
The third angle is, therefore:
We, therefore, have the set: 
(b)Given the angles 42° and 66°
The third angle is, therefore:
We, therefore, have the set: 
(c)Given the angles 60° and 60°
The third angle is, therefore:
We, therefore, have the set: 
Answer:
Step-by-step explanation:
is C
40-12