Answer:

Step-by-step explanation:
Add the 2 equations together, then solve for x.

Now that we know the value of x, we can easily find y by substitution.

These are the answers
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Y=mx+c is the slope standard form
5y=-30-4x
5y=-4x-30
Y=-4/5x-6
Answer: A, and their proportional relationship is 5
Step-by-step explanation:
The critical points of the function graphed are given as follows:
<h3>What are the critical points of a function?</h3>
The critical points of a function are the values of x for which:

In a graph, they are turning points, and are classified as follows:
- Local maximum, if the functions changes from increasing to decreasing.
- Local minimum, if the functions changes from decreasing to increasing.
Looking at the graph, the turning points are approximately:
More can be learned about critical points at brainly.com/question/2256078
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Answer:
60
Step-by-step explanation:
x + 0.30x = 78
1.30x = 78
x = 60