-2x+5y=-15 5x+2y=-6 how many solutions does this system have

Step-by-step explanation:

-2x + 5y = -15

5x + 2y = -6

-10x + 25y = -75

10x  + 10y  = -30

35y = -105

y = -3

5x + 2(-3) = -6

5x - 6 = -6

5x = 0

x = 0

(0, -3)

one solution

23.75 + [(0.18)(23.75)]

Step-by-step explanation:

Ellen plans to leave an 18% tip with her $23.75 lunch bill.

Therefore, to determine her total bill, she use the expression

= 23.75 + ( 18% of 23.75 )

= 23.75 + ( 0.18 × 23.75 )

or 23.75 + [(0.18)(23.75)]

So the expression is 23.75 + [(0.18)(23.75)] to determine her total bill.