2 Answers

Fabianopinto · Answer 1 · 2018-04-25T15:09:48+0000

$\left \{ {{2.4 = .3x + .4y} \atop {5x = 2 + 6y}} \right.$

5x = 2 + 6y
Divide both sides by 5
x = 6/5y + 2/5

Input in the other equation.

2.4 = .3(6/5y + 2/5) + .4y
2.4 = .36y + .12 + .4y
2.4 = .76y + .12
Subtract .12 from both sides.
2.28 = .76y
Divide both sides by .76
3 = y

x = 6/5(3) + 2/5
x = 18/5 + 2/5
x = 20/5 = 4

(4, 3)

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