To solve this system of equations by elimination, what operation could be used to eliminate the x-variable and find the value of y?

4x + 3y = 6
18x + 5y = 6

Respuesta :

Answer:

The value of y is [tex]y=\frac{42}{17}[/tex]

Step-by-step explanation:

we have

[tex]4x+3y=6[/tex] -----> equation A

[tex]18x+5y=6[/tex] -----> equation B

To eliminate the x-variable and find the value of y Multiply the equation A by -18/4 both sides or multiply the equation B by -4/18 both sides

I choice

Multiply the equation A by -18/4 both sides

[tex](-18/4)[4x+3y]=6*(-18/4)[/tex]

[tex]-18x-13.5y=-27[/tex] ------> equation C

Adds equation B and equation C

[tex]18x+5y=6\\-18x-13.5y=-27\\-------\\5y-13.5y=6-27\\-8.5y=-21\\\\ y=\frac{42}{17}[/tex]