Equasion 1 ax+by=c equasion 2 dx+ey=f
a, b,c, d,e and f are non zero real numbers which of the following could replace equasion 1 and still have the same solution

Cumulative examcumulative exam active13time remaining02: 44: 18the graph represents the data cost for monthly internetservice for a cell phone.which function, c(x), represents the monthly cost in dollarsin terms of x, the number of gigabytes used in a month? cell phone internet service(15,5x + 10150,0sx522 < x < 664x115, osx< 25x + 20, 2< x< 650, 65815%,monthly cost (s)20x + 5| 50x,0 < x < 22 < x < 664x( 15x, osx< 2c(x) = 5x + 10, 2< x< 6150x, 65 x5+1234 5 6 7 8 9 10 11 12gigabytes used

Explain step-by-step how to simplify -5(2x – 3y + 6z – 10).

What is the value of x when x + 7 = 21?