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Sagot :
ok sure!
first we have to find y
so...
lets start with the first one:
5x+y=2 (we cannot have two variables together so:
5x+y=2
-y =-y so.. now we have 5x= 2-y (but we must get y positive and by itself!)
-2 = -2
so: now you have
5x-2=-y but need a positive variable so multiply each side by a (-1)
(-1) 5x-2=-y (-1) So..
-5x +2 =y so now we know Y!
therefore whenever you see why in the next problem insert in its place: -5x +2
I hope it helps!! :)
first we have to find y
so...
lets start with the first one:
5x+y=2 (we cannot have two variables together so:
5x+y=2
-y =-y so.. now we have 5x= 2-y (but we must get y positive and by itself!)
-2 = -2
so: now you have
5x-2=-y but need a positive variable so multiply each side by a (-1)
(-1) 5x-2=-y (-1) So..
-5x +2 =y so now we know Y!
therefore whenever you see why in the next problem insert in its place: -5x +2
I hope it helps!! :)
5x + y = 2 ⇒ 10x + 5y = 4
2x + 3y = 62 ⇒ 10x + 15y = 310
-10y = -306
-10 -10
y = -30.6
5x - 30.6 = 2
+30.6 +30.6
5x = 32.6
5 5
x = 6.52
(x, y) = (6.52, -30.6)
2x + 3y = 62 ⇒ 10x + 15y = 310
-10y = -306
-10 -10
y = -30.6
5x - 30.6 = 2
+30.6 +30.6
5x = 32.6
5 5
x = 6.52
(x, y) = (6.52, -30.6)
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