The answer is D. He has to buy less than or equal to 4 masks
the shorter sides are 4 inches and the longer sides are 21 inches long
Any number can be x and y
Answer:2x+15+6x-37/2=3x+5
We move all terms to the left:
2x+15+6x-37/2-(3x+5)=0
We add all the numbers together, and all the variables
8x-(3x+5)+15-37/2=0
We get rid of parentheses
8x-3x-5+15-37/2=0
We multiply all the terms by the denominator
8x*2-3x*2-37-5*2+15*2=0
We add all the numbers together, and all the variables
8x*2-3x*2-17=0
Wy multiply elements
16x-6x-17=0
We add all the numbers together, and all the variables
10x-17=0
We move all terms containing x to the left, all other terms to the right
10x=17
x=17/10
x=1+7/10
Answer:
![-14x-9y=6](https://tex.z-dn.net/?f=-14x-9y%3D6)
Step-by-step explanation:
We are given with two equations
first equation is ![-7x-y=0](https://tex.z-dn.net/?f=-7x-y%3D0)
second equation is
![7x+8y=-6](https://tex.z-dn.net/?f=7x%2B8y%3D-6)
we find the result of subtracting two equation
subtract the second equation from the first, so
first equation - second equation, multiply second equation by -1 and then add it with first equation
![-7x-y=0](https://tex.z-dn.net/?f=-7x-y%3D0)
![-7x-8y=+6](https://tex.z-dn.net/?f=-7x-8y%3D%2B6)
Now add both equations, we get
![-14x-9y=6](https://tex.z-dn.net/?f=-14x-9y%3D6)