the answer to 3 3/7÷6/7 is 4
X + y = 1.....multiply by -2
2x - 3y = -30
-----------------
-2x - 2y = -2 (result of multiplying by -2)
2x - 3y = -30
----------------add
-5y = -32
y = -32/-5
y = 32/5 or 6.4 <===
Answer:
C. 2.5
Step-by-step explanation:
If the number is -2.5
Basically the opposite in a summary
Answer:
117 students, 8 adults
Step-by-step explanation:
Let's say a adults went and s students went.
Total cost for adults = 23 for each a = 23a
Total cost for each student = 16s
Number of adults and students = a + s = 125
Total cost = 23a + 16s = 2056
a + s = 125
23a + 16s = 2056
We can solve this by solving for a and then plugging that into the other equation, making it so that there is only one variable
subtract s from both sides in the first equation
a = 125 - s
plug that into the second equation
23(125 - s) + 16s = 2056
2875 - 23s + 16s = 2056
2875 - 7s = 2056
subtract 2875 from both sides to isolate s and its coefficient
-7s = -819
divide both sides by -7 to isolate s
s = 117
a = 125 - s = 125 - 117 = 8
It is 1
70+30*1=100, which is not a prime number
