x + y = 4 x - 2y = -5 If the first equation is multiplied by 2 and then the equations are added, the result is _____. 3x = 13 3x = 3 x = 3
x + y = 4 multiple 2 on both sides: 2x + 2y = 8 equation 1; x - 2y = -5 equation 2; Adding up equation 1 and equation 2, 3x = 3 x + y = 4, x - 2y = -5 If the first equation is multiplied by 2 and then the equations are added, the result is 3x = 3.
Question
Updated 4/29/2014 8:57:06 PM
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x + y = 4 multiple 2 on both sides:
2x + 2y = 8 equation 1;
x - 2y = -5 equation 2;
Adding up equation 1 and equation 2,
3x = 3
x + y = 4, x - 2y = -5 If the first equation is multiplied by 2 and then the equations are added, the result is 3x = 3.
Confirmed by jeifunk [4/29/2014 9:04:42 PM]

Questions asked by the same visitor
For the following system, use the second equation to make a substitution for y in the first equation. 3x + y = 2 y + 4 = 3x 3x + 3x - 4 = 2 3x + 3 - 4x = 2 3x + 3x + 4 = 2
Question
Updated 4/29/2014 8:55:10 PM
For the following system, use the second equation to make a substitution for y in the first equation 3x + y = 2, y + 4 = 3x, the result is: 3x + 3x - 4 = 2.
Confirmed by jeifunk [4/29/2014 8:56:11 PM]
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