This is for a quiz do at midnight. Does anybody mind helping? Which of the following is equivalent to 2x+4y=7.
A. 4x+8y=14
B. x+2y=7
C. x+2y=14
D. 4x+8y=7
Which of the following is equivalent to 6x-2y=4
A. y+3x=2
B. y+3x=-4
C. -y+3x=2
D. 3x+y=4

What is the solution to the system of the equations? x = y - 3 x + 3y = 13

In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula c= r/1.8 - 273, what is the temperature in celcius corresponding to r degrees rankine.

Acompany that manufactures and sells guitars made changes in their product range. from the start they had 20 models. then they reduced the number of models to 15. as a result, the company enjoyed a 10% increase in turnover. - how much did the stock level change? in (%)