
Substitute x = 3 in any given equations. I will do in y = - x + 1

Therefore the answer is (3,-2)
Set 40 = 5x + 10
Subtract 10 on both sides, then divide 30 by 5
x = 6
2a+3
Step-by-step explanation:
Answer:
x=9
Step-by-step explanation:
x = 3^2
x = 3*3
x=9