4x+(x+5)=20
5x+5=20
5x=15
X=3
For this case we have the following system of equations:

Equating both equations we have:

We must find the solutions, for this we factor. We look for two numbers that, when multiplied, result in 4 and when added, result in 5. These numbers are 4 and 1:

Then, the factorized equation is of the form:

Thus, the solutions are:

We look for solutions for the variable "y":

Thus, the system solutions are given by:
ANswer:

Answer:
Yes
Step-by-step explanation:
If the longest side squared is equal to the sum of the squares on the other 2 sides then they form a right triangle
longest side = 7.5
7.5² = 56.25
2.1² + 7.2² = 4.41 + 51.84 = 56.25
Thus the 3 values form a right triangle.
6 gallons in 4 1/2 seconds to travel 1/4 mile
Multiply through by 4
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The dragster will :
use 24 gallons in 18 seconds to travel 1 mile.
It would be 2/10 or 1/5 simplified