4 2 SOLVING SYSTEMS OF EQUATIONS BY SUBSTITUTION

4 -2 SOLVING SYSTEMS OF EQUATIONS BY SUBSTITUTION HOMEWORK: 17 -29

IN THIS CHAPTER I CAN… • 4 -1: graph two linear equations to find an approximate solution • 4 -2: use substitution to solve two linear equations • 4 -3: use elimination to solve two linear equations • 4 -4: graph all solutions to a linear inequality • 4 -5: graph all solutions to two linear inequalities

SOLVE BY SUBSTITUTION (4, 5) ONE SOLUTION

SOLVE BY SUBSTITUTION (1, -3) ONE SOLUTION

SOLVE BY SUBSTITUTION INFINITE SOLUTIONS

SOLVE BY SUBSTITUTION (2, -2) ONE SOLUTION

SOLVE BY SUBSTITUTION NO SOLUTIONS

4 -2 SOLVING SYSTEMS OF EQUATIONS BY SUBSTITUTION HOMEWORK: 30 -35 PARENT SHEET

WORD PROBLEM Mr. Trimble needs work over the summer, so he starts a lawn mowing business. The lawn mower costs $200, and the gas costs $2 per lawn. If he makes $25 per lawn, how many lawns does Mr. Trimble need to mow to make a Cost Profit profit? x = number of lawns 9 lawns

WORD PROBLEM At Mr. Trimble’s resort, you can surf and parasail for $175. If 20 people surf and 16 people parasail, it costs $3101. How much is it to surf? How much is it to parasail? x = cost to surf y = cost to parasail Surfing costs $75. 25 Parasailing costs $99. 75