Question

Solve the system of equations using SUBTRACTING and ADDING

x + 5y = 35 2. x + 2y = 20
2x + 5y = 26 9x – 2y = 80

Answer 1

1. x= -9, y=8.8

2. x=10, y=5

Explanation:

1. (2x+5y)-(x+5y)=26-35

2x+5y-x-5y= -9

x= -9

5y=35-x=35-(-9)=35+9=44

y=44/5=8.8

2. (x+2y)+(9x-2y)=20+80

x+2y+9x-2y=100

10x=100

x=100/10=10

2y=20-x=20-10=10

y=10/2=5

Answer 2

x,+5y=352x+2y=20,2x+5y=269x-2y=80