1. Which of the following systems is (2, -3) a solution? (Choose all that apply)
a. x+y = -1
b. 2x-y=7
c. 10x + 2y = 28
3x + y = 3
5x + y = 14
6x - 3y = 21
d. 9x - 5y = 33
7x + 2y = 8

Simonne used the following steps to simplify the given expression. 12 - 3(-2x + 4) step 1: 12 + (–3)·(–2x) + (–3)·(4) step 2: 12 + 6x + (–12) step 3: 12 + (–12) + 6x step 4: 0 + 6x step 5: 6x what property of real numbers was used to transition from step 3 to step 4? a. identity property of addition b. inverse property of addition c. associative property of addition d. commutative property of addition

Prove that quadrilateral is a rhombus.

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?