Working:
7y + 42 = -14x
7y = -14x - 42
y = ((-14x - 42) ÷ 7)
Expand and Simplify:
y = -2x - 6
Factorise:
y = -2(x +3)
x = -3
Substitute x=-3 into equation.
7y + 42 = -14(-3)
7y + 42 = 42
7y = 0
Divide 7, on both sides, to get rid of the coefficient (7), thus, making y the subject.
y = 0 [anything divide or times to zero, will always remain zero]
Following model: (x,y)
Answer: (-3,0)
Hope this helps. Chur :)
Answer: (19,520-1,478) x 8
6+3n≤40
Use inverse operations i.e.
4x+2<10
-2 -2
4x<8
4*x/4<8/4
x<2
3 times I can tell by solving the problem on paper and clearly seeing how many times you have to regroup. Plus the answer is 487