Question

Solve 2x+10y=-20 and -x+4y=28 by elimination

Answer 1

multiply -x+4y=28 by 2
-2x+8y=56
add to first equation
2x+10y=-20
-2x+8y=56 +
0x+18y=36

18y=36
divid 18
y=2
subsitute
-x+4y=28
-x+4(2)=28
-x+8=28
subtract 8
-x=20
multipy -1
x=-20



x=-20
y=2

(x,y)
(-20,2)