Question

metodo de sustitucion
5x+6y=20
4x-3y=-23

Answer 1

5X+6Y=20 ; 5X=20-6Y ; X=(20-6Y)/5

4X-3Y=-23 ; 4X=-23+3Y ; X=(-23+3Y)/4

Igualmos "X"

(20-6Y)/5=(-23+3Y)/4

80-24Y=-115+15Y

195=39Y

Y=5

5X+6(5)=20

5X+30=20

5X=20-30

X=-10/5

X=-2