Question

solve by substitution method

x+6y=50
-5x+5y+15

Answer 1

your second equation is incorrect

Answer 2

-5x+5y=-5

Answer 3

whoops, lost in translation

Answer 4

x+6y=50
x=50-6y------eqn 1
now, -5(50-6y) +5y=-5
-250+30y+5y=-5
35y=245
y=7
then, x=50-6*7
x=8

Answer 5

just plug in x = 50 -6y in second eqn
- 5(50 -6y) + 5 y = -5
-50 +6y +y = -1
7y = 49
y = 7

so, x = 50 -6y =50 - 42 = 8

Answer 6

y=7
x=8