Step 1: Add the two equations.
Step 2: Solve for x.
Step 3: To find the y-value, substitute in 3 for x in one of the equations.
Step 4: Solve for y.
Step 5: Identify the solution as an ordered pair.
What if adding or subtracting does not eliminate a variable? Example. 3x – y = 8. x + 2y = 5.
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Answer:
AB = 8
Step-by-step explanation:
AC = 36
AB/BC = 2/7
AB = (2/7)BC
AB + BC = 36
(2/7)BC + BC = 36
(9/7)BC = 36
BC = 36(7/9)
BC = 4*7
BC = 28
AB + BC = 36
AB = 36 - 28
AB = 8
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Is AB/BC = 2/7?
8/28 = 2/7 YES
