The solution of the system of equations:
( -16.7, 19.28)
<h3>
How to solve the system of equations?</h3>
Here we have the system:
4x+3y=9
3x +4y = 36
First, we need to isolate one of the variables in one of the equations, let's isolate x on the second one:
x = 36/3 - (4/3)y = 9 - (4/3)y
Now we can replace this in the other equation:
4*(9 - (4/3)y) + 3y = 9
36 - (16/3)y + (9/3)y = 9
- (7/3)y = -36 - 9 = -45
y = (3/7)*45 = 19.28
To get the value of x, we get:
x = 9 - (4/3)*19.28 = -16.7
Then the solution of the system is ( -16.7, 19.28)
If you want to learn about systems of equations:
brainly.com/question/13729904
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Answer:
30
Step-by-step explanation:
3:4=9:12-total students 21
3:4=12:16-total students 28
3:4=15:20-total students 35
