Answer:
230 peeps per square mile
Step-by-step explanation:
Equation By Substitution/Elimination Method:
y = -3x + 4; y = 4x - 10
Let's solve your system by substitution.
y = −3x + 4; y = 4x − 10
Step: Solve y = −3x + 4 for y:
y = −3x + 4
Step: Substitute −3x + 4 for y in y = 4x − 10:
y = 4x − 10
−3x + 4 = 4x − 10
−3x + 4 + −4x =4x − 10 + −4x (Add -4x to both sides):
−7x + 4 = −10
−7x + 4 + −4 = − 10 + −4 (Add -4 to both sides):
-7x = -14
-7x/ -7 = -14/ -7 ( Divide both sides by -7):
x = 2
Step 2: Substitute 2 for x in y = −3x + 4:
y = −3x + 4
y = (−3)(2) + 4
y = −2 (Simplify both sides of the equation)
Answer:
x = 2
and
y = −2
Hope that helps!!!!
The third one [15x+30y-220]
Answer: A) 82.3
Step-by-step explanation:
Mean= average
To find mean, you add up all the numbers and divide by the number of numbers.
In this case you do:
(81+78+83+89+80+87+78) ÷ 7
81+78+83+89+80+87+78
=576
Now, divided by 7
576 ÷ 7
= 82.2857142857
Round to nearest tenths place
= 82.3