Answer:
x = -3 and y = -2
Step-by-step explanation:
It is given that,
-7x + 6y = 9 ----(1)
-2x - 5y = 16 -------(2)
<u>To find the solution of given equations</u>
eq(1) * 2 ⇒
-14x + 12y = 18 ------(3)
eq(2) * 7 ⇒
-14x - 35y = 112 ---(4)
eq (3) - eq(4) ⇒
-14x + 12y = 18 ------(3)
<u>-14x - 35y = 112 </u> ---(4)
0 4y = -94
y = 94/(-47) = -2
Substitute the value of y in eq (2)
-2x - 5y = 16 -------(2)
-2x - 5*-2 = 16
-2x +10 = 16
-2x = 6
x = 6/-2 = -3
Therefore x = -3 and y = -2
A computer discounted at 30% off is less expensive.
First: 1000*.8 = 800
800*.9 = $720
Second: 1000*.7 = $700
Answer:
I think it is 3.5
Step-by-step explanation:
8.5:250*100 =
(8.5*100):250 =
850:250 = 3.4
37 is 25% of 148; 148 is 400% of 37
Step-by-step explanation:
Let us solve the questions one by one
"37 is ____ % of 148"
Let x be the percentage
Then

to convert in percentage, multiplying by 100
= 25%
"148 is ____ % of 37"
Let y be the percentage
then

To convert into percentage, multiplying by 100
= 400%
Hence,
37 is 25% of 148; 148 is 400% of 37
Keywords: Percentage, percent
Learn more about percentage at:
#LearnwithBrainly
Answer is B. Have a nice day.