Answer:
A, B, C and D. are solutions.
Step-by-step explanation:
x^2 + y^2 = 13
x^2 - y^2 = 5
Check which roots fit the original equations:
If x = 3, A gives
9 + y^2 = 13 giving y = +/- √4 = 2 or -2.
Now plug in x = 3 and y = 2 in the second equation:
9 - (2)^2 = 5
Therefore (3,2) is a solution of the 2 equations.
Following the same procedure for B, C and D:
B. Substituting x = 3 and x = -2 fits both equations so (3, -2) is a solution.
The same is true for C and D.
Answer: -7/9
Step-by-step explanation: 12-19=-7 and 10-19 = -9, so -7/9.
Answer:
47/100
Step-by-step explanation:
rs/qr = cos R
32/68 = cos r
0.47
Answer:
288
Step-by-step explanation:
