Question

Multiply each equation by a number that produces opposite coefficients for x or y

1x-1y=100
3/8x + 7/8y= 2000

Answer 1

1st option is: -3

2nd option is: 8

Step-by-step explanation: I just did the assessment on edge

Answer 2

Explanation:

`\left\{\begin{array}{ccc}1x-1y=100&\text{multiply both sides by (-3)}\\(3)/(8)x+(7)/(8)y=2000&\text{multiply both sides by 8}\end{array}\right\\\\\left\{\begin{array}{ccc}-3x+3y=-300\\3x+7y=1600\end{array}\right\\\\\text{or}\\\\\left\{\begin{array}{ccc}1x-1y=100&\text{multiply both sides by 7}\\(3)/(8)x+(7)/(8)y=2000&\text{multiply both sides by 8}\end{array}\right\\\\\left\{\begin{array}{ccc}7x-7y=700\\3x+7y=1600\end{array}\right`