Answer:
B) 5x+15y=30
5x-5y=10
Step-by-step explanation:
First, we solve the top equations by addition. Multiply the first one by -4.
-4x-12y=-24
4x-8y=4
This equals -20y=-20, so y=1. Now we put that back into either equation and find that x=3. So the solution set is (3,1)
Plugging those into each of the possible choices, we find that the answer is
B) 5x+15y=30. 5(3)+15(1)=30 15+15=30. 30=30 CHECK
5x-5y=10 5(3)-5(1)=10. 15-5=10. 10=10. CHECK
Answer:
40units²
Step-by-step explanation:
find the shapes you know the formula of. There's two shapes a rectangle and a trapezoid.
do the formula for rectangle
A = bh
A = 8×2
A = 16
Now the formula for Trapezoid
A = 1/2h(b+b)
A = 1/2×4(4+8)
A = 1/2×4(12)
A = 1/2(48)
A = 24
16+24 = 40
Answer:
equal
Step-by-step explanation:
Most quadratic equations have <em>equal</em> roots.
Ox......,,,,,,,,,,,,,,,,,,
;)
Angles in a triangle must add up to 180, so the missing angle inside the triangle is 180 - (70 + 40), which is 70.
Angles on a straight line (i.e. the line BD) must add up to 180, and because we know part of that angle is 70, x must be 180 - 70, which is 110.
Hence, x is 110 degrees.
