Plz plz somebody help

Is (6, 3) a solution to the system?
3x – 4y = 30
y=-2x + 15

At a lunchron, guests are offered a selection of five different grilled vegetables and four different meats. in how many waya could one choose three vegetables and two meats?

In the diagram below, tan θ = sqrt 3. what is the value of m?

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2