5 - 2X = 15
subtract 5 from each side
- 5 + 5 - 2X = 15 - 5
-2X = 10
divide each side by - 2
X = - 5
check
5 - 2(-5) = 15
5 + 10 = 15
15 = 15
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-52x + 3 = 7 -52x + 3 = 7 -3 -3 -52x = 4 /52 /52 -x = 1/13 /-1 /-1 x = -1/13
(2x - 10) + 7 = 52x - 3 = 52x = 8x = 4
2x - 3 = 2x - 52x = 2x - 22x - 2x = -20 =/= -2Zero is not equal to -2 so the answer is no solution.
x - y = 52x + y = 7 (use the substitution method)y = x - 52x + y = 7 (substitute x - 5 for y into the second equation)2x + y = 72x + x - 5 = 73x = 12x = 4Thus x = 4 satisfies both the equations of the system.
15 percent 0 equals 0; 0 percent 15 equals 0. Both the above are true