Karen will pay $21,25 at Store A
She will pay $22.5 at Store B
She should buy her jeans at Store A
Hope this helps!!
Given equations are;<span>
2a + 3b = -1 ..................equation 1
3a + 5b = -2 ....................equation 2</span>
Now multiply equation 1 with (-3)
The equation will be;
-6a -9b = 3 …………………..equation 3
Now multiply equation 2 with (2)
The equation will be;
6a + 10b = -4 ……………..equation 4
Now add equation 3 and equation 4
-6a – 9b = 3
<span>6a + 10b = -4</span>
<span>------------------------------</span>
0a + b = -1
b = -1
Now put the value of b in equation 1
2a + 3(-1) = -1
2a -3 = -1
2a = -1+3
2a = 2
a=1
Thus the solution is (a,b) = (1,-1)
<span>
</span>
She bought 2 books and 6 magazines.
Step-by-step explanation:
Given,
Price of a book = $ 5
Price of a magazine = $ 4.50
Total amount of book Luca bought = $ 37
Total number of books she bought = 8
To find the number of books and magazine she bought.
Let, she bought x number of books ans y number of magazines.
According to the problem,
x+y = 8 -----eq 1
5x+4.50y = 37 ------ eq 2
or, 10x+9y = 74 [ multyplying eq 2 by 2]
Putting x = 8-y from eq 1 into eq 2 we get,
10(8-y)+9y = 74
or, 80-10y+9y = 74
or, -y = 74-80
or, -y = -6
or, y = 6
From eq 1 we get,
x = 8-6 = 2
Hence,
She bought 2 books and 6 magazines.