4x-y=7 , 3x-2y=-6 solve by substitution method
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Answered by
1
4x - y = 7
4x = y+7
x = (y+7)/4
Put this in eq 2.
3*(y+7)/4 - 2y = -6
3y + 21 - 8y = -6*4
-5y = -24 - 21
y = -45/-5
y = +9.
Put this in eq 1.
4x - 9 = 7
4x = 7+9
x = 16/4
x = 4.
Therefore, x=4 and y=9.
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4x = y+7
x = (y+7)/4
Put this in eq 2.
3*(y+7)/4 - 2y = -6
3y + 21 - 8y = -6*4
-5y = -24 - 21
y = -45/-5
y = +9.
Put this in eq 1.
4x - 9 = 7
4x = 7+9
x = 16/4
x = 4.
Therefore, x=4 and y=9.
Please mark as brainliest if it helps you...
Answered by
1
4x-y=7
.•.y=4x-7 (1)
3x-2y=-6
or 3x-2(4x-7)=-6
or 3x-8x+14=-6
or -5x=-6-14
.•. x=4
substitute the value of x in (1)
y=4×(4)-7
=9 answer
.•.y=4x-7 (1)
3x-2y=-6
or 3x-2(4x-7)=-6
or 3x-8x+14=-6
or -5x=-6-14
.•. x=4
substitute the value of x in (1)
y=4×(4)-7
=9 answer
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