Answer:
Let pens be x and y be pencils
Let's solve now
7x+2y=22 equation 1
3x+4y=11 equation 2
let's make y the subject of the formular in equatio 1
y=(22-7x)/2
substituting y into the second equation yield
3x+4(22/2-7x/2)=11
Now find x.
Step-by-step explanation:
set notebooks as x, set pens as y
1. 5x + 7y = 11
2. 4x + 2y = 7
1. times by 2
10x + 14y = 22
2. times by 7
28x + 14y = 49
2. minus 1.
18x = 27
x = 1.5
sub 1.5 into 2.
4(1.5) +2y = 7
6+2y = 7
2y = 1
y = 0.5
Therefore, x = 1.5, y = 0.5
Answer:
A= trapezoid B= triangle C= triangle D= trapezoid
A#b = 2a(7-b)
(2#5)#3
Let us look at the parentheses first.
2#5 = 2*2(7-5)
= 4(2)
= 8
Now the equation becomes 8#3
8#3 = 2*8(7-3)
=16(4)
= 64
The value is 64. Hope this helps!
I’m sorry bc I don’t know how to solve all of them but
#5 is C
#3, the equation is y=4
#4, the equation is x=-6
