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3 years ago

6

X - y = 3 x + 3y = 9

2 answers:

Ugo [173]3 years ago

7 0

Solve for one of the variables in the first equation (in this case, I will solve for X):
X = Y + 3

Then use that value of X in the second equation to solve for Y:
X + 3Y = 9
(Y + 3) + 3Y = 9
4Y + 3 = 9
4Y = 6
Y = 1.5

Use the value of Y we just found in the X equation we created:
X = Y + 3
X = 1.5 + 3
X = 4.5

Therefore X = 4.5 or 9/2 and Y = 1.5 or 3/2.

Verizon [17]3 years ago

3 0

<span>X - y = 3 is the same as x=3+y </span>
<span>
3+y+3y = 9 </span>
<span>
3+4y=9 </span>
<span>
4y=9-3
</span>
<span>4y=6
</span>
<span>y=6/4
</span>
<span>y=3/2 </span>
<span>
x-(3/2)=3 </span>
<span>
x=3+(3/2) </span>
<span>
x=6/2+3/2 </span>
<span>

x=9/2</span>

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