Question

-3x+5y=-9 and 4x+8y=12

Answer 1

Explanation:

the system is : -3x+5y=-9 ......(1)

4x+8y=12......(2)

divid by 4 in (2) : x +2y = 3....... x = 3 -2y

put the value for x in (1) : - 3(3-2y) +5y = -9

-9+6y +5y =- 9

11y=18 so y=0 x = 3-2(0) = 3

Answer 2

-3x + 5y = -9

4x + 8y = 12

Simplify the second,

x + 2y = 3

Times three,

3x + 6y = 9

Add to the first equation,

11y = 0

y = 0

-3x + 5(0) = -9

x = 3

Answer: x=3, y=0