How to solve - 3x+8y=-18. (the bottom) 0=-10y-5x+30 using elimination?

-3x+8y=-18

0=-10y-5x+30

First move the 30 to the other side of the equal sign so you have the problum

-3x+8y=-18

-5x-10y=-30

Now times the top problum by 5 and the bottom one by 3 to get the new problum

-15x+40y=-90

-15x-30y=90

Now that you have a commen number in both problums you would subtract both of the problums.

-70y=180

Now that you have that divide the - 70 on both sides.

y=2.57

Now you would substitute the y for the 2.57 in one of the problums.

-15x-30 (2.57) = 90

Times the - 30 with the 2.57.

-15x-77=90

Now subtract the - 77 on both sides.

-15x=13

Now divide the - 15 on both sides to get your answer for x.

x=.86

Now thats your answers

y=2.57

x=.86

(.86,2.57)