A variable needs to be eliminated to solve the system of equations below. Choose the correct first step.
3x – 4y = -43
- 4x 4y = -36
Subtract to eliminate y.
Subtract to eliminate x.
Add to eliminate x.
Add to eliminate y.

Aregression was run to determine if there is a relationship between hours of tv watched per day (x) and number of situps a person can do (y). the results of the regression were: y=ax+b a=-0.662 b=30.418 r2=0.703921 r=-0.839

Ascatterplot is produced to compare the size of a school building to the number of students at that school who play an instrument. there are 12 data points, each representing a different school. the points are widely dispersed on the scatterplot without a pattern of grouping. which statement could be true

Write the fraction 9/50 as a decimal if needed round to the nearest hundredth