(4,10). 1. There are three ways to solve this: elimination, substitution, graphing. 2. I chose elimination, so I had to get one negative variable and one positive variable of the same value (for example, 18 and -18)
-7x+2y=-8 -16x+9y=26 I chose to get 2y and 9y to equal -18y and 18y. So, multiply the first equation by -9. Multiply the second by 2. 63x-18y=72 -32x+18y=52 the 18s cross each other out. So you're left with 63x=72 -32x=52. Add them. 31x=124, divide both sides by 31, and you'll get 4. x=4 Plug your answer for x into one of the equations. Let's use the first one. -7(4)+2y=-8 -28+2y=-8. add 28 to both sides. 2y=20, divide both sides by 2. y=10. This makes your answer (4,10)
SO the suit cost $95 and it has a discount of 10% so 95*10/100=9.5 so 10% of 95 is 9.5 subtract 9.5 from 95 and that equals 85.5 then you have to add 4.5 percent sales tax so 85.5+ 4.5%= 89.347 So the final cost would be $89.34
