To eliminate y from each linear system, by what numbers

Question

would you multiply equations 1 and 2 ?
1) 3x - 7y = 11
2) 5x + 8y = 9
1) 4x + 3y = 12
2) -2x + 5y = 7
1) 9x - 4y = 10
2) 3x + 2y = 10

Answer 1

For the first linear system, you would multiply equation 1 by -8 and equation 2 by 7 to eliminate y.

For the second linear system, you would multiply equation 1 by 5 and equation 2 by 3 to eliminate y.

For the third linear system, you would multiply equation 1 by 2 and equation 2 by -9 to eliminate y.