Lets make the graph of our systems of equations:
The blue line correspond to the equation x-y=3 and the red one correspond to 7x-y=-3. The lines intersect at point (-1,-4), then, the solution of the system is (-1,-4).
This one 10 + x12 = 12x + 10 is <span>a) commutative - addition
And this </span>10 + x12 =10 + 12x is <span>e) commutative - multiplication
So you use them both. And they're both correct. </span>
Answer:
I'm pretty sure 2 and 5
Step-by-step explanation:
Hope this helps :)