Hi,please help me.with this question im.confuse. please help me with question 1c
2 answers:
1c. 3x - 2y = 6
x = 5 - 2y
What they mean by substitution is that you need to put that x that they gave you into the x of the first equation to get y.
Right now it looks like this:
3x - 2y = 6
Now you have to put (5 - 2y) into the x of the equation.
3(5 - 2y) - 2y = 6
Now solve.
First distribute the 3.
15 - 6y - 2y = 6
Combine like terms.
15 - 8y = 6
Get rid of the 15 by subtracting it from both sides.
-8y = -9
Divide both sides by -8.
y = 1.125
Now put the y into the second equation.
x = 5 - 2(1.125)
x = 5 - 2.25
x = 2.75
x = 2.75
y = 1.125
3x-2y=6
x=5-2y
replace x in the 1st equation with x in the 2nd one so you get:
3(5-2y)-2y=6
15-6y-2y=6
15-8y=6
-8y=-9
y=1.125
x=5-2(1.125) = 5-(2.25)=2.75
check: 3(2.75)=8.25, 2(1.125)=2.25, 8.25-2.25 = 6
y = 1.125
x = 2.75
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hope it helps
sorry if I'm wrong
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