Solve for substitution
y+5x= -3
3y-2x= 8

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.

What number should be added to both sides of the equation to complete this square? x^2-10x=7

What expression is equivalent to 1/2(2+3x-6)