Question

In which line is a mistake first made when solving the following system of equations by elimination for x? 5x + 3y = 12 4x - 5y = 17
Line 1
25x + 15y = 60
4x - 5y = 17

Line 2
25x + 15y = 60
20x - 15y = 85

Line 3
45x = 145

Line 4
x = 29/9

Answer 1

- in the second line bc. the second equation we need multiplie just by 3 and ot by 5 
- so there above was multiplied by 5 and so than 5*(-5y) not equal -15y so this is equal -25y