1. 19x+7.8+4.8x-4.9+3y2. 18y-7y+8.5+y2+9.7

1.

19x + 7.8 + 4.8x - 4.9 + 3y     combine like terms

= (19x + 4.8x) + 3y + (7.8 - 4.9)

2.

18y - 7y + 8.5 + y² + 9.7    combine like terms

= y² + (18y - 7y) + (8.5 + 9.7)

.there can be infinite values of m and n that can satisfy the above equation. for each value of m of m or n. there maybe infinite sets of solution for the above

step-by-step explanation:

i think the answer is c sorry if it's wrong