Question

Which ordered pairs in the form (x, y) are solutions to the equation 3x - 4y = 21?

Choose all answers that are correct.

A.
(-3, 3)

B.
(-1, -6)

C.
(7, 0)

D.
(11, 3)

Answer 1

3x - 4y = 21

lets check...
A. (-3,3)...x = -3 and y = 3
now we sub
3(-3) - 4(3) = 21
-9 - 12 = 21
- 21 = 21 ---- not this one

B. (-1,-6)...x = -1 and y = -6
now we sub
3(-1) - 4(-6) = 21
-3 + 24 = 21
21 = 21 (correct)---- this is one

C. (7,0)...x = 7 and y = 0
now we sub
3(7) + 4(0) = 21
21 + 0 = 21
21 = 21 (correct) ---- this is one

D. (11,3)...x = 11 and y = 3
3(11) + 4(3) = 21
33 + 12 = 21
45 = 21 --- not this one

Answer 2

thank you so much,when you can.Can you figure out these 3 other questions?