## anonymous one year ago y = 3x + 3 y = x − 1 Explain how you will solve the pair of equations by substitution. Show all the steps and write the solution in (x, y) form.

1. TheSmartOne

Any ideas?

2. TheSmartOne

Do you know what the substitution method is?

3. TheSmartOne

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4. anonymous

just flip it to the other side y=3x+3 becomes y-3/3=x and y=x-1 becomes y+1=x

5. anonymous

thanksss

6. texaschic101

y = 3x + 3......so now we substitute 3x + 3 in for y in the other equation y = x - 1 3x + 3 = x - 1 --- subtract x from both sides 3x - x + 3 = x - x - 1 -- combine like terms 2x + 3 = -1 --- subtract 3 from both sides 2x + 3 - 3 = -1 - 3 -- combine like terms 2x = -4 -- divide both sides by 2 2/2x = -4/2 x = -2 now we sub in -2 for x in either of the original equations to find y y = 3x + 3 y = 3(-2) + 3 y = -6 + 3 y = -3 now we check.. y = x - 1 -3 = -2 -1 -3 = -3 (correct) so your solution is : (-2,-3)