Answer:
(-6, -3)
General Formulas and Concepts:
<u>Algebra I</u>
- Solving systems of equations by graphing
Step-by-step explanation:
Where the 2 lines intersect would be where the solution set to the systems of equations. We see from the graph that our 2 lines intersect at (-6, -3). Therefore, our solution set is (-6, -3).
Answer:
75
Step-by-step explanation:
100-25=75
100.8/360 (to work out percentage of circle therefore percent of 1125 books)
= 0.28
= 28%
0.28 x 1125
= 315 books sold were Mystery books
The answer is 2x
3
+5x
2
−x−6
Answer:
-5
Step-by-step explanation:
Substituting x=4 into the equation gives a 2-step linear equation in y. It is solved by isolating the variable and making its coefficient be 1.
__
<h3>use x=4</h3>
When x=4, the equation becomes ...
-3x +9y = -57
-3(4) +9y = -57
-12 +9y = -57
<h3>solve 2-step equation</h3>
The <u>first step</u> is to "isolate" the variable term (9y) by adding the opposite of the constant that is on the same side of the equation. The result is that the variable term is by itself on one side of the equal sign.
-12 +12 +9y = -57 +12 . . . . . add the opposite of -12
9y = -45 . . . . . . . . . . . . . . simplify
The <u>second step</u> is to make the coefficient of y be 1. We do that by multiplying by its inverse, 1/9. Equivalently, we divide by 9.
(1/9)(9y) = (1/9)(-45) . . . . multiply by the inverse of 9
y = -5 . . . . . . simplify
