How to simplify variable expressions

7x+8y=-18, 4x-9y=-3 solve the system of equations

What is (28 + 7 + 6 + 3) x 1/2 show your work

Brent needs to paint a logo made using two right triangles. the dimensions of the logo are shown below. what is the difference between the area of the large triangle and the area of the small triangle? (1 point) select one: a. 4.5 cm2 b. 8.5 cm2 c. 16.5 cm2 d. 33.0 cm2