Answer:
<u>x= -7 , y= 9</u>
Steps:
4x+3y=-1
5x+4y=1
First, multiply the top equations by -5, and the bottom by 4 to get :
-20x-15y=5
20x+16y=4
Then, you’re going to add the two equations with them being on top of each other so you can easily see what cancels out :
-20x-15y=5
+ 20x+16y=4
———————
0+1y=9
From this, you get :
y=9
Now that you have one variable, find x by substituting 9 for y in one of the equations, I choose :
4x+3y=-1
So :
4x+3(9)=-1
Then simplify by multiplying 3 and 9 :
4x+27=-1
Then subtract 27 on each side :
4x=-28
Then, divide by 4 to get that :
x= -7
Hope this helps!!
Answer:
You can break the figure up into 3 rectangles which I have colored red, yellow and pink.
The red rectangle will be 5m x 9m
the yellow rectangle will be 4m by (14m - 5m -5m) which equals 4m x 4m
and the pink rectangle is the same as the red rectangle - 5m x 9m
the area of the red rectangle is 5x9 = 45m2
the area of the yellow rectangle is 4x4=16m2
the area of the pink rectangle is 5x9=45m2
the area of the figure is 45+16+15=106m2
Step-by-step explanation:
Given:
Our first step would be to distribute the (6-2v) by -1, since there is an understood -1 in front of the parenthesis. We are then left with:
Combine like terms.
Add 6 to both sides to isolate 9v on one side of the equation.
Divide both sides by 9 to isolate v.
Simplify.
Answer:
40% profit
140% markup
Step-by-step explanation:
I'm not sure if it's asking what is the markup, or how much you are making.
But profit
$20 out of 50 = 0.40
Markup
70/50 = 1.4 -> 140% markup
Answer:
There are 36 boys in the class.
Step-by-step explanation:
This question is solved by a system of equations.
I am going to say that:
x is the number of boys
y is the number of girls.
There are 42 pupils in a class.
This means that .
Since we want x, we have that
12 of them are Malays while the rest are Chinese. 1/4 of the boys and 1/2 of the girls are Malay.
This means that:
Since
Multiplying everything by 4.
There are 36 boys in the class.