Question

HELP!! Examine this system of equations. Which numbers can be multiplied by each equation so that when the two equations are added together, the y term is eliminated?

1/4x - 1/6y =5

4/5x + 3/8y =10


a. 18 times the first equation and 8 times the second equation
b. –18 times the first equation and 8 times the second equation
c. 8 times the first equation and 6 times the second equation
d. –8 times the first equation and 6 times the second equation

Answer 1

1/4*x - 1/6*y= 5 |*18
4/5 *x + 3/8*y = 10 | *8

18/4*x -3*y= 90
32/5*x + 3y = 80
-------------------------
18/4*x+32/5*x / = 170

The answer is a