solve the simultenous equation: 0.4x + 2y = 10 and 0.3x + 5y = 18?

Answer 1

0.4x + 2y = 10
0.2x + y = 5
y = 5 - 0.2x

0.3x + 5y = 18
0.3x + 5(5 - 0.2x) = 18
0.3x + 25 - x = 18
25 - 0.7x = 18
-0.7x = -7
x = 10

y = 5 - 0.2x
y = 5 - 0.2(10)
y = 5 - 2
y = 3

Answer 2

you will might desire to multiply the equations so as that jointly as they're greater on an identical time between the pronumerals will cancel out: (2x + 3y = 2) * -one million 2x + 5y = 10 -2x - 3y = -2 upload them new equations into one yet yet another: 2y = 8 y = 4 Now which you realize what y equals, use that to be sure for x: 2x + 12 = 2 2x = -10 x = -5 —————— overall: x = -5 y = 4 As an ordered pair: (-5, 4)

Answer 3

Multiply the first equation by 5 and the second one by -2.
5(.4x + 2y = 10) --> 2x + 10 y = 50
-2(.3x + 5y = 18) --> -.6x + -10y = -36

Add the two resulting equations to get:
1.4x = 14

Divide both sides by 1.4 to get x = 14/1.4 = 10

Then substitute x =10 back into either of the original equations like this:
0.4(10) + 2y = 10
4 + 2y = 10
2y = 6
y = 3
Final answer x = 10, y = 3

Answer 4

Multiply the first equation by 3 we get, 1.2x +6y = 30 and similarly multiply the 2nd equatio by 4 we get , 1.2x + 20y =72

Now substract 1st from 2nd , we get 14y = 42 or y = 3 .Now put this value in the 1st orignal equation and solve for the value of x , which is equal to 10

Answer 5

Multiply by 10 throughout to get rid of the decimal fraction. Therefore:
4x + 20y = 100 and 3x + 50y = 180

Now begin to work. I know you just wanted some help with the decimal. Good Luck

Answer 6

change the first equation to y = -.2x + 5
then plug it in for the other y in the other equation
.3x + 5(-.2x + 5) = 18
simplify
.3x - x + 25 = 18
to
-.7x = -7
x = 10
plug 10 in for x into either equation
y = -.2(10) + 5
y = 3

Answer 7

4/10x+2y=10 same nominator
3/10x+5y=18
4x+20y=100 /-3=>-12x-60y=-300
3x+50y=180 /4=> 12x+200y=720
140y=420=>y=3
4x+60=100=>x=1

Answer 8

Do your own homework. You won't learn anything this way.