lys1
lys1
08-04-2015
Mathematics
Answered
substitution for 4x+y=9 and y=-7
Answer :
eu99li
eu99li
08-04-2015
{
y
=-7
{4x+
y
=9
Substitute y.
4x+
(-7)
=9
4x-7=9
/+7
4x=16
/:4
x=4
Solution;
(4; -7)
Answer Link
iGreen
iGreen
08-04-2015
4x + y = 9
y = -7
Plug it in:
4x - 7 = 9
Add 7 to both sides:
4x = 16
Divide 4 to both sides:
x = 4
Plug this back into the equation:
4x + y = 9
4(4) + y = 9
16 + y = 9
Subtract 16 to both sides:
y = -7
So our solution is (4, -7)
Answer Link
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