equal values method

Question

y=2x-3 and y=2x+1

Answer 1

set them equal to each other

2x - 3 = 2x + 1

subtract 2x from both sides

then -3 = 1  this is a false statement so there is no solution (the lines are parallel)

Answer 2

y=x+2
y=2x-1

Answer 3

T-talk cell phone company charges a flat rate of 15$ month plus $0.10 per minute in calls. Mobile serves does not charge a flat rate but charges $0.30 per minute in calls how many minutes would you have to talk in order to charge them the same?? Need a rule for both too.

 

sam I am is filling his pool at a rate of 3.2 feet per minute. At the same time, Peter piper has 16 feet of water in his pool and is emptying at a rate f 1.6 feet per minute will they have the senount of water? Need a rules for both too.

 

one tomato plant is 12 inches tall and grows 1 inch per week. Another tomato plant is 6 inches tall an grows 2 inches per week. Write and solve an equation to find when the plants will be the same height. Need a rule for both too.

Answer 4

Y=3x+7

y=4x+21

Answer 5

x^2+x=2x^2-6