Answer:
n=5
Step-by-step explanation:
4 + 7n - 42 = -3
+42 +42
4 + 7n = 39
-4 -4
7n = 35
÷7 ÷7
n = 5
Answer:
41
Step-by-step explanation:
Answer:
4th option, (cy+b)/a
Step-by-step explanation:
By algebraic manipulation, we add b to both sides, then divide by a to isolate x.
6.9 x 100 = 690
6 x 100 = 600
0.9 x 100 = 90
600 + 90 = 690
All you have to do is plug in the x and y values for each ordered pair into the left hand side of the equation and see if you get 15 = 15. If you do, the ordered pair is a solution; otherwise it is not a solution. For example, let's try (-2,-3); that is x = -2 and y = -3:
2x - 9y = 15
2(-2) - 9(-3) = 15
-4 - (-27) = 15
-4 + 27 = 15
23 = 15
This is obviously not true, so (-2,-3) is not a solution. Now you try it on each of the ordered pairs given in the problem statement.
