Solve by substitution. x plus yx+y equals=1010 yy equals=xplus+22 select the correct choice below and, if necessary, fill in the answer box to complete your choice. a. the solution of the system is nothing. (type an ordered pair, using integers or fractions.) b. the system has infinitely many solutions. c. the system has no solution.

Sherina wrote and solved the equation. x-56=230 x-56-56=230-56 x=174 what was sherina’s error? sherina’s work is correct. sherina only needed to subtract 56 from 230. sherina made a subtraction error when subtracting 56 from 230. sherina should have added 56 to both sides of the equation.

The swimming pool is open when the high temperature is higher than 20∘c. lainey tried to swim on monday and thursday (which was 3 days later). the pool was open on monday, but it was closed on thursday. the high temperature was 30∘c on monday, but decreased at a constant rate in the next 3 days. write an inequality to determine the rate of temperature decrease in degrees celsius per day, d, from monday to thursday.

Pranza plotted point a in the coordinate plane below.