x+5y=20 2x-7y=-45 solve by elimination

Question

x+5y=20

2x-7y=-45

solve by elimination

Answer 1

multiply the 1st equation by 2

2x +10y = 40

2x -7y =-45

subtract the 2nd equation to eliminate x

17y = 85

y = 85/17 = 5

y =5

x =20-5y =20-25 = -5

x =-5

x =-5 and y=5