IsyssY231808 IsyssY231808
  • 03-11-2022
  • Mathematics
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solving systems with subtraction y=7txy=3x+9

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AzalyaO672040 AzalyaO672040
  • 03-11-2022

y = 7 + x

y = 3x + 9

To solve the simulataneous equation with subtraction,

Step 1: name the equations

y = 7 + x ---- equation 1

y = 3x + 9 ----- equation 2

Step 2: subtract equation 1 from 2

so that

y - y = (3 x -x ) + (9 - 7)

0 = 2x + 2

2x = - 2

divide oth sides by 2

x = -2/2

x = -1

To get y, substitute the value for x into equation 1

y = 7 + x

y = 7 + (-1)

y = 7-1 = 6

y = 6

hence the solution is (-1, 6)

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