Question

Find the value of y to the following system of equations.

0.1x + 0.5y = 1.2
-0.1x - 0.2y = -0.8

Answer 1

y = 4/3

Explanation:

The two equations can be added to eliminate x:

(0.1x +0.5y) + (-0.1x -0.2y) + (1.2) +(-0.8)

0.3y = 0.4 . . . . . simplify

Divide by the coefficient of y to find y:

y = 0.4/0.3

y = 4/3