Answer:
(21, 28)
Step-by-step explanation:
Multiply coordinates by 7.
The 3rd one . shows how to substitute "x" . The most frequent Way
Answer:
Step-by-step explanation:
it is 6
The way I'd do this is by elimination. Multiply 4x+y=-10 by -14x+4y=20-4x-y=105y=30y=6
As for x multiply 4x+y=-10 by -4
4x+4y=20-16x-4y=4012x=60
x=5